+62 857: The Ultimate Guide to Indonesia's Country Code, Scam Calls, and Calling from the U.S.

Receiving an unexpected call or message from an unfamiliar international number can be unsettling. When that number begins with the digits +62 857, it originates from a specific country and a particular type of mobile service. Understanding the components of this number is the first step in determining its legitimacy and deciding on the appropriate course of action. The structure of this number provides a highly granular piece of intelligence, pointing not just to a country of origin but to a specific mobile carrier and a class of service that has significant implications for user security.

Immediate Identification

A phone number in the international format +62 857-xxxx-xxxx can be broken down into three distinct parts, each providing a crucial piece of information about its origin and nature.

+62: The Country Code for Indonesia. The initial prefix, +62, is the international direct dialing (IDD) code assigned to the Republic of Indonesia by the International Telecommunication Union (ITU).1 This code is used for all calls originating from Indonesia to other countries. Any phone number, whether landline or mobile, that begins with
+62 is registered within the Indonesian telecommunications system.3
857: A Mobile Network Prefix. Following the country code, the number 857 is not a city or regional area code. Within Indonesia’s telephone numbering plan, prefixes that begin with the digit ‘8’ are exclusively designated for mobile (cellular) phone services.4 The
857 prefix is specifically assigned to the mobile network operator Indosat Ooredoo Hutchison (IOH), one of the largest telecommunications companies in the nation.4
Service Type: Prepaid Mobile. Further analysis of the Indonesian mobile network prefixes reveals that the 857 series is allocated to Indosat’s prepaid mobile services, often marketed under the brand “im3 Prepaid”.6 This distinction is critically important. Unlike postpaid services, which typically require formal contracts, identity verification, and a credit history, prepaid SIM cards in many regions can be acquired with greater anonymity and in large quantities. This ease of acquisition makes them an attractive tool for individuals and organizations seeking to obscure their identity, a common practice in the execution of fraudulent activities.

In summary, a phone number formatted as +62 857-xxxx-xxxx is definitively a prepaid mobile number operating on the Indosat Ooredoo Hutchison network within Indonesia.

Why You’re Likely Searching for This Number

While there are many legitimate reasons for international communication, a significant volume of online searches for specific international number formats, including +62 857, is driven by a growing global issue: unsolicited and often malicious contact. Individuals in the United States and other countries frequently report receiving unexpected calls, text messages, or, most commonly, WhatsApp messages from numbers with the +62 prefix.9 These communications are rarely benign; they are often the initial phase of a wide array of scams. The fact that this specific number is a prepaid mobile line is not a trivial detail; it is a potential risk indicator that aligns perfectly with the methods used by international scam syndicates. This context shifts the query from a simple question of “what is this number?” to a more urgent concern of “is this number a threat?”

The Threat Landscape: Unsolicited Calls and Scams from +62 Numbers

The proliferation of internet-based communication has created a borderless environment, which, while beneficial for global connectivity, has also been systematically exploited by criminal enterprises. Numbers originating from the +62 country code, particularly from prepaid mobile lines like the 857 prefix, have become prominently associated with a global surge in digital fraud. These are not isolated incidents of wrong numbers but are often part of sophisticated, large-scale campaigns designed to defraud individuals through social engineering.

The Widespread Phenomenon

In recent years, a notable increase in unsolicited international calls and messages has been reported worldwide, with a significant portion originating from Indonesian +62 numbers.9 User forums and social media platforms contain numerous accounts from individuals, including many in the United States, describing persistent and repeated calls from various

+62 numbers. The pattern of receiving calls from multiple different numbers within the same country code suggests an organized effort, where scammers use a large pool of SIM cards to evade blocking attempts.10

The platform of choice for these campaigns is overwhelmingly WhatsApp. The reason for this is strategic and economic. WhatsApp utilizes Voice over Internet Protocol (VoIP), which transmits voice and message data over the internet rather than traditional cellular networks.9 This allows scammers to bypass the substantial costs associated with international phone calls, enabling them to target millions of users across the globe at virtually no expense. This cost-benefit analysis has transformed a personal communication tool into a highly efficient global scam delivery network.

Common Scam Tactics Originating from Indonesian Numbers

The scams originating from +62 numbers are not random; they follow well-established and predictable scripts designed to exploit common human psychological triggers such as greed, fear, and trust.

Fake Job Offers: A prevalent scam involves a message from a person claiming to be an HR representative from a well-known company. They offer a simple, lucrative part-time job, with a common example being the promise of payment for “liking” YouTube videos or social media posts.9 The initial payments may even be real, a tactic used to build trust before the scammer requests a larger payment for “premium membership,” “training materials,” or “account activation,” after which they disappear.13
Investment and Cryptocurrency Scams: These scams prey on the desire for quick financial returns. Fraudsters present “can’t-miss” investment opportunities in stocks, bonds, or, most frequently, cryptocurrency.13 They often use fake websites, fabricated success stories, and high-pressure tactics to create a sense of urgency. Victims are instructed to send funds via cryptocurrency because its decentralized and often anonymous nature makes transactions nearly impossible to trace or reverse.15
Impersonation and Social Engineering: Scammers may impersonate a friend, family member, or a government official. They might claim to be in an emergency and in urgent need of money, or they might pose as a law enforcement officer threatening arrest unless a fake fine is paid.15 The increasing accessibility of Artificial Intelligence (AI) has made these scams far more dangerous. With just a few seconds of a person’s voice—which can be captured from a voicemail greeting or a previous call—scammers can use AI voice cloning technology to create a realistic audio deepfake of a loved one in distress, making the plea for money incredibly convincing and emotionally manipulative.17
The “Showbiz Scam”: A Targeted Attack on U.S. Citizens: The threat posed by these criminal networks is underscored by a specific, high-level investigation conducted by the U.S. Federal Bureau of Investigation (FBI). The “Indonesia Showbiz Scam” involves transnational criminals targeting U.S. citizens working in the entertainment industry, such as writers, stunt professionals, and makeup artists.19 Victims are contacted with a lucrative and seemingly legitimate job offer that requires them to travel to Indonesia. Upon arrival, they are met by a “driver” and are systematically extorted for money for various services and fees under the guise of the project. The job is entirely fraudulent, and victims are left with significant financial losses from travel and extortion, with no reimbursement.19 This case is a stark illustration that behind the high volume of low-effort WhatsApp scams are well-funded, coordinated criminal syndicates with the logistical capability to execute complex, multi-stage frauds that physically endanger their targets. This elevates the threat from a digital nuisance to a matter of national security and personal safety for Americans.

The Scammer’s Playbook: How They Operate

The operational model for these scams is both simple and effective, relying on the accessibility of modern technology and telecommunications infrastructure.

Acquisition of Numbers: Scammers can easily purchase VoIP numbers online that can be registered to WhatsApp, or they can leverage local contacts in Indonesia to buy prepaid SIM cards in bulk.9 The widespread availability and minimal identity verification required for prepaid cards create a vast, anonymous supply of numbers for fraudulent use.
Verification and Targeting: The initial contact, whether a missed call, a silent call, or a simple message like “Hello,” often serves a single purpose: to verify that the target’s phone number is active and monitored by a real person.17 Any form of response, even a negative one, confirms the number as a viable target and often leads to it being added to lists that are sold to other scammers, resulting in an increase in future unwanted contacts.20

Official Warnings and Consumer Protection

U.S. government agencies, particularly the Federal Trade Commission (FTC), provide clear guidance on recognizing and avoiding phone scams. This advice is directly applicable to the threats originating from +62 numbers. Key red flags identified by the FTC include 22:

Pressure to Act Immediately: Scammers create a false sense of urgency to prevent you from thinking critically or verifying their claims.
Specific Payment Methods: Scammers demand payment through methods that are difficult to trace and recover, such as wire transfers, gift cards, or cryptocurrency. No legitimate business or government agency will demand payment in this manner.
Requests for Sensitive Information: Any unsolicited call asking for your Social Security number, bank account details, or passwords is a scam.
Threats and Intimidation: The FTC explicitly warns that real law enforcement and federal agencies, such as the IRS or FBI, will not call and threaten you with arrest, deportation, or fines.22 Such tactics are the hallmark of an impersonation scam.

An unsolicited call from a +62 857 number should therefore not be dismissed as a simple annoyance. It could represent the first step in a sophisticated fraud attempt by an organized criminal group that has a documented history of targeting and victimizing U.S. citizens.

Your Action Plan: A Step-by-Step Guide to Handling Unwanted Contact

When faced with an unsolicited call or message from an unknown international number like +62 857, the most effective defense is a proactive strategy of disengagement and reporting. The goal is to make your number an unproductive target for scammers, thereby removing it from their active lists and protecting yourself from potential fraud. The following steps provide a clear and safe protocol for handling such contact.

Step 1: Do Not Engage

The single most important rule is to avoid any form of interaction. This means do not answer the call, and do not reply to the message.20

Engaging with the caller in any capacity is a critical mistake. Scammers use initial contact as a verification method. By answering, you confirm that your number is active and belongs to a real person, which immediately increases its value to the scammer and makes you a target for future attempts.20 Even a brief interaction, such as saying “Hello?” or “Who is this?”, can be detrimental. With the rise of AI voice-cloning technology, scammers can record these simple words and use them to create a digital replica of your voice for use in impersonation scams against your family and friends.17 The safest action is always inaction. Let the call go to voicemail; scammers rarely leave a message.17

Step 2: Identify and Verify (Safely)

While direct engagement is dangerous, you can safely gather intelligence about the number using third-party tools. This can help confirm your suspicions and provide data for reporting.

Reverse Phone Lookup: This technology allows you to search for information linked to a phone number without contacting the owner.26 The effectiveness of these services for a specific Indonesian prepaid number can vary, as it depends on the number’s digital footprint—how much public data is associated with it.27 While a search may not yield the owner’s name, it is often highly effective at aggregating community-sourced data.
Using Caller ID and Spam Blocking Apps: Applications like Truecaller are particularly effective for identifying international spam. Truecaller has a massive global user base, including a significant presence in Asia, and its database is continuously updated by users who report spam and scam numbers.28 When you look up a number like
+62 857-xxxx-xxxx in Truecaller, it may display a name like “Spam” or “Job Scam,” based on reports from other users. Furthermore, the app provides valuable “Spam Statistics,” which can show how many times the number has been reported as spam, its peak calling hours, and other risk indicators, all of which help you assess the threat level without any direct contact.31

Step 3: Block and Report

After confirming the number is unsolicited and likely malicious, the next step is to prevent future contact and report the activity to the relevant platforms and authorities. This action not only protects you but also contributes to a collective defense system.

Blocking on Your Device: Both iOS and Android operating systems have built-in features to block specific phone numbers. This is a straightforward process typically accessed through the recent calls list.
Blocking and Reporting within WhatsApp: WhatsApp provides a crucial, integrated “Block and Report” function. When you receive a message from an unknown contact, the app gives you the option to block the number, which prevents them from calling or messaging you again. Critically, you should also use the “Report” feature. This sends the last five messages from the user to WhatsApp’s moderation team and adds the number to their monitoring systems. This user-generated data is vital for helping WhatsApp identify and ban the millions of accounts that engage in spam and scam activities each month.9
Reporting to U.S. Authorities: All fraudulent contact attempts should be reported to the Federal Trade Commission (FTC). The primary portal for this is ReportFraud.ftc.gov.23 This centralizes scam data from across the country, allowing the FTC to track trends, identify criminal networks, and build cases against them. For scams with an international component, the FTC collaborates with a network of over 65 global consumer protection agencies through
econsumer.gov, ensuring your report contributes to international law enforcement efforts.33

By taking the extra step to report a number, you are not just acting in self-interest; you are actively participating in a global, crowdsourced effort to disrupt the infrastructure that allows these scam networks to operate.

Step 4: Secure Your Accounts

Finally, take proactive steps to harden your digital accounts against potential attacks.

Enable Two-Step Verification: On WhatsApp and other messaging platforms, enable two-step verification (also known as two-factor authentication). This feature requires a six-digit PIN of your creation when you register your phone number with WhatsApp again, preventing a scammer from hijacking your account even if they manage to compromise your SIM card or phone number.32
Practice Digital Hygiene: Never click on suspicious links or download attachments sent from an unknown number. Be wary of any message that asks for personal information, financial details, or login credentials.32 Legitimate companies and agencies will not request such sensitive information via an unsolicited WhatsApp message.

Calling Indonesia from the USA: A Complete Cost and Dialing Guide

While many searches for the +62 857 number are driven by security concerns, there are legitimate needs for individuals and businesses in the United States to connect with contacts in Indonesia. Navigating the process of international calling requires understanding the correct dialing format and the significant cost variations among different service providers. Making an informed choice can prevent exorbitant charges on your phone bill.

How to Dial Indonesia from the USA

To successfully place a call to an Indonesian phone number from the United States, a specific dialing sequence must be followed. This sequence involves the U.S. exit code, the Indonesian country code, and the local number, with a key modification for domestic trunk prefixes.

Step 1: Dial the U.S. Exit Code (011). All international calls originating from the U.S. must begin with 011. This code signals to the telephone network that the subsequent numbers are for an international destination.35
Step 2: Dial the Indonesia Country Code (62). Immediately after the exit code, dial 62. This is the country-specific code that routes the call to Indonesia’s telecommunications network.36
Step 3: Dial the Area Code or Mobile Prefix (Omitting the Trunk ‘0’). This is the most common point of error. When dialing within Indonesia, local numbers are often preceded by a ‘0’ (the trunk prefix). For international calls, this leading ‘0’ must be dropped.4

For Landlines: Dial the one- to three-digit city or area code. For example, the area code for Jakarta is 21, and for Surabaya, it is 31.4
For Mobile Phones: Dial the mobile carrier’s prefix. For the number in question, this would be 857.4

Step 4: Dial the Local Subscriber Number. Finally, dial the remaining digits of the local phone number.

Example Dialing Formats:

To call a landline in Jakarta with the local number xxxx-xxxx:
011-62-21-xxxx-xxxx
To call a prepaid Indosat mobile number with the local number xxxx-xxxx:
011-62-857-xxxx-xxxx

Cost Analysis: Comparing Your Options

The cost of calling Indonesia from the U.S. varies dramatically depending on your carrier and calling plan. Standard pay-per-minute rates can be extremely high, while monthly plans or alternative services can offer significant savings for those who make frequent calls.

The significant cost associated with legitimate international calls from the U.S. stands in stark contrast to the methods used by scammers. While a U.S. consumer faces a complex and expensive pricing landscape, a scammer in Indonesia can place thousands of calls for free using VoIP services like WhatsApp. This economic imbalance is a key driver of the scamming phenomenon; the choice of a free, unsolicited platform for initial contact is itself a major red flag of fraudulent intent.

The following tables compare the costs across major U.S. carriers.

Carrier	Pay-Per-Minute Rate (to Landline)	Pay-Per-Minute Rate (to Mobile)	Source(s)
T-Mobile	$3.00/minute	$3.00/minute	40
Verizon	Varies (Standard rates start at $0.49/min)	Varies (Standard rates start at $0.49/min)	42
AT&T	Varies by destination ($1.00-$3.00/min range)	Varies by destination ($1.00-$3.00/min range)	43
Table 1: U.S. Carrier Standard Pay-Per-Minute Rates to Indonesia. Rates are subject to change and may not include taxes and fees. Users should verify current rates with their provider.

For users who need to make regular or lengthy calls, a monthly international calling plan is almost always more cost-effective.

Carrier	Plan Name	Monthly Cost	Included Minutes/Rates for Indonesia	Source(s)
T-Mobile	Stateside International Talk	$15/month	Unlimited calling to both landline and mobile numbers	41
Verizon	Global Choice	$10/month	180 minutes included, then $0.05/minute thereafter	45
AT&T	International Calling	$15/month	Discounted per-minute rates (specific rates not published)	47
Table 2: U.S. Carrier International Calling Plan Comparison for Indonesia. Plan details and pricing are subject to change.

Alternative Calling Methods

Beyond traditional mobile carriers, several other options can provide more affordable ways to call Indonesia.

VoIP Services: Voice over Internet Protocol services like Skype and Viber are often the cheapest way to call international landlines and mobiles. These services use your internet connection to place the call. For example, Viber advertises rates to Indonesia starting as low as 3.9 cents per minute, a fraction of the cost of standard carrier rates.36
International Calling Cards: These prepaid cards offer a set number of minutes to a specific country for a fixed price. While they can be cost-effective, they often involve dialing long access numbers and PINs, making them less convenient than other methods.12
Wi-Fi Calling: This feature, available on most modern smartphones, allows you to make calls over a Wi-Fi network. It is important to understand how it is billed. When you are in the U.S. and use Wi-Fi calling to contact an Indonesian number, it is still treated as an international call and will be billed according to your carrier’s international rates.50 However, if you are traveling in Indonesia and use Wi-Fi calling to contact a number back in the U.S., the call is typically free.

The Source: A Closer Look at Indonesia’s Mobile Network

To fully comprehend the context of a call from +62 857, it is essential to understand the telecommunications landscape from which it originates. Indonesia’s mobile market is one of the largest and most dynamic in the world, and its unique characteristics—hyper-saturation, a dominance of prepaid services, and the ubiquity of specific messaging apps—create a fertile environment for the types of scam operations that target global users.

Profile of Indosat Ooredoo Hutchison (IOH)

The 857 prefix is directly tied to Indosat Ooredoo Hutchison (IOH), a major force in the Indonesian telecommunications sector.

Company Overview: IOH is one of Indonesia’s largest telecommunications service and network providers. The current company is the result of a major 2022 merger between two of the country’s key operators: Indosat Ooredoo and Hutchison 3 Indonesia.51 This consolidation created a stronger competitor to the market leader, Telkomsel.
Market Position: As of the first quarter of 2024, IOH reported a customer base of over 100 million subscribers, securing its position as the second-largest mobile operator in the country.52 The company offers a comprehensive suite of services, including prepaid mobile plans under the IM3 and 3 (Tri) brands, postpaid plans, and fixed-line and broadband internet services.51
Prepaid Dominance: A defining characteristic of IOH’s subscriber base, and the Indonesian market as a whole, is the overwhelming preference for prepaid services. The vast majority of the company’s over 100 million subscribers are on prepaid plans.54 This model offers flexibility to consumers but also presents challenges for regulation and identity verification, which can be exploited for illicit purposes.

Indonesia’s Telecommunications Landscape: A Snapshot (2024-2025)

The scale and nature of Indonesia’s digital environment are key to understanding why it has become a significant source of global spam and scam calls. The combination of a massive, mobile-first population, a saturated market for SIM cards, and the deep penetration of a single messaging platform creates a perfect storm.

Metric	Statistic	Implication	Source(s)
Total Population	~278.7 Million (Early 2024)	A vast domestic market and a large pool of potential targets and perpetrators.	56
Cellular Mobile Connections	~353.3 Million (Early 2024)	The number of mobile connections is 126.8% of the total population, indicating a hyper-saturated market where many individuals use multiple SIM cards.	56
Internet Penetration	66.5% (Early 2024)	A large and growing online population that is increasingly reliant on digital services for communication and commerce.	56
Dominant Mobile OS	Android (92.06%)	The open nature of the Android ecosystem can, in some cases, make it more susceptible to third-party applications and malware.	57
Most Popular Messaging App	WhatsApp	With a 65% penetration rate, WhatsApp is the de facto communication standard, making it the most effective channel for scammers to reach the widest possible audience.	58
Table 3: Indonesian Mobile Market at a Glance. Data reflects statistics from early 2024.

The Mobile-First Environment

Unlike many Western countries that had a long history with landline infrastructure, Indonesia is a profoundly mobile-first nation. Many consumers bypassed traditional landlines entirely and adopted mobile phones as their primary and often sole means of telecommunication.60 This has led to the hyper-saturation seen in the market, where the number of active SIM cards far exceeds the population. This phenomenon, driven by competitive promotions from carriers and the consumer habit of using different SIM cards for different purposes (e.g., data vs. calls), results in a large, fluid, and often anonymous market for SIM cards.

This environment has profound consequences. A scammer operating in Indonesia has access to a virtually limitless supply of inexpensive, anonymous prepaid SIM cards. This resource, combined with the country’s near-universal adoption of WhatsApp as a free communication platform, provides the perfect infrastructure for conducting large-scale, low-cost, and difficult-to-trace scam campaigns targeting a global audience. The problem of scam calls from +62 is not a temporary glitch but a systemic issue deeply rooted in the technological and economic structure of the country’s telecommunications market. This suggests that such fraudulent activities are likely to persist and evolve, making user education and proactive defense the most critical long-term solutions for potential targets in the United States and elsewhere.

Works cited

www.rebtel.com, accessed July 19, 2025, https://www.rebtel.com/en/international-calling-guide/phone-codes/indonesia/#:~:text=Indonesia%20country%20code%3A%20%2B62
Indonesia Country Code 62 – Worldometer, accessed July 19, 2025, https://www.worldometers.info/country-codes/indonesia-country-code/
Call Rates to Indonesia and How to Call | Lebara Australia, accessed July 19, 2025, https://www.lebara.com.au/prepaid-plans/rates/indonesia/
Telephone numbers in Indonesia – Wikipedia, accessed July 19, 2025, https://en.wikipedia.org/wiki/Telephone_numbers_in_Indonesia
Prefix | PDF | Computers – Scribd, accessed July 19, 2025, https://www.scribd.com/doc/308791876/Prefix
List of mobile telephone prefixes by country – Wikipedia, accessed July 19, 2025, https://en.wikipedia.org/wiki/List_of_mobile_telephone_prefixes_by_country
Indosat – Indonesia – Wireless Frequency Bands and Device Compatibility, accessed July 19, 2025, https://www.frequencycheck.com/carriers/indosat-indonesia
Indosat Ooredoo Prepaid SIM Card – SIMCard.SG, accessed July 19, 2025, https://www.simcard.sg/product/indosat-ooredoo-prepaid-sim-card/
Watch out for that international WhatsApp call and text – Entrackr, accessed July 19, 2025, https://entrackr.com/2023/05/watch-out-for-that-international-whatsapp-call-and-text/
Getting multiple WhatsApp calls from foreign numbers : r/delhi – Reddit, accessed July 19, 2025, https://www.reddit.com/r/delhi/comments/12uzirq/getting_multiple_whatsapp_calls_from_foreign/
Getting WhatsApp calls from phone numbers starting +84, +62, +60, more? Don’t pick, it is a scam – India Today, accessed July 19, 2025, https://www.indiatoday.in/technology/news/story/getting-whatsapp-calls-from-phone-numbers-starting-plus-84-62-60-more-do-not-pick-it-is-a-scam-2376979-2023-05-09
(+62)Country Code Indonesia: Easy Dialing & Cost Savings – TKOS, accessed July 19, 2025, https://www.tkos.co.za/country-code/indonesia/
12 WhatsApp scams to know and avoid – Norton, accessed July 19, 2025, https://us.norton.com/blog/online-scams/whatsapp-scams
Recieved a random message from Indonesia saying ‘Ola” hello in my language : r/whatsapp, accessed July 19, 2025, https://www.reddit.com/r/whatsapp/comments/18pt57y/recieved_a_random_message_from_indonesia_saying/
Addressing Legal Ambiguities and Regulatory Gaps: Defining Online Fraud and Scams in Indonesia – Safer Internet Lab, accessed July 19, 2025, https://saferinternetlab.org/addressing-legal-ambiguities-and-regulatory-gaps-defining-online-fraud-and-scams-in-indonesia/
What is the biggest scam that has occurred in Jakarta, Indonesia? Can you explain how it operated and how it was uncovered? – Quora, accessed July 19, 2025, https://www.quora.com/What-is-the-biggest-scam-that-has-occurred-in-Jakarta-Indonesia-Can-you-explain-how-it-operated-and-how-it-was-uncovered
Indonesia Ranks 2nd with the Most Spam Calls in Asia Pacific – Cisometric Cybersecurity Firm, accessed July 19, 2025, https://www.cisometric.com/articles/indonesia-ranks-2nd-with-the-most-spam-calls-in-asia-pacific
“What Are Your Needs?” New Scam In Indonesia Uses President Deepfakes – NDTV, accessed July 19, 2025, https://www.ndtv.com/world-news/deepfake-scam-prabowo-subianto-new-scam-in-indonesia-uses-president-deepfakes-what-are-your-needs-7828472
— Seeking Victims in Indonesia Showbiz Scam Investigation – FBI.gov, accessed July 19, 2025, https://forms.fbi.gov/victims/seeking-victims-in-indonesia-showbiz-scam-investigation
Stop Unwanted Robocalls and Texts | Federal Communications Commission, accessed July 19, 2025, https://www.fcc.gov/consumers/guides/stop-unwanted-robocalls-and-texts
Scam calls: Tips-Tricks-Myths? : r/indonesia – Reddit, accessed July 19, 2025, https://www.reddit.com/r/indonesia/comments/1j29s4x/scam_calls_tipstrikmitos/?tl=en
Phone Scams | Consumer Advice, accessed July 19, 2025, https://consumer.ftc.gov/articles/phone-scams
Recognizing Scams | Federal Trade Commission OIG, accessed July 19, 2025, https://oig.ftc.gov/ftc-imposter-scams
Frequently Asked Questions – ReportFraud.ftc.gov – FAQ, accessed July 19, 2025, https://reportfraud.ftc.gov/faq/faq-search/scam%20alert
I am getting calls from unknown numbers in international format.What should I do? – Quora, accessed July 19, 2025, https://www.quora.com/I-am-getting-calls-from-unknown-numbers-in-international-format-What-should-I-do
Reverse Phone Number Lookup – KrispCall, accessed July 19, 2025, https://krispcall.com/tools/reverse-phone-lookup/
Reverse Phone Lookup: What It Is and How It Works – SEON, accessed July 19, 2025, https://seon.io/resources/reverse-phone-lookup/
Truecaller’s Spam Call and SMS Blocking Solution for Surveillance on Social Media – ResearchGate, accessed July 19, 2025, https://www.researchgate.net/publication/360275451_Truecaller’s_Spam_Call_and_SMS_Blocking_Solution_for_Surveillance_on_Social_Media/fulltext/637fa8ac7b0e356feb7caf7c/Truecallers-Spam-Call-and-SMS-Blocking-Solution-for-Surveillance-on-Social-Media.pdf
Truecaller Insights Report 2019 Reveals Indonesia Third Most Spammed Country, accessed July 19, 2025, https://indonesiaexpat.id/featured/truecaller-insights-report-2019-reveals-indonesia-third-most-spammed-country/
Truecaller Insights: Top 20 Countries Affected By Spam Calls In 2021, accessed July 19, 2025, https://www.truecaller.com/blog/insights/top-20-countries-affected-by-spam-calls-in-2021
Free Reverse Phone Number Lookup by Truecaller, accessed July 19, 2025, https://www.truecaller.com/reverse-phone-number-lookup
Keeping WhatsApp Users Safe in Indonesia, accessed July 19, 2025, https://faq.whatsapp.com/1033383468131023
FAQs – ReportFraud.ftc.gov – Federal Trade Commission, accessed July 19, 2025, https://reportfraud.ftc.gov/faq
Top 9 most common Whatsapp scams to watch out for – NordVPN, accessed July 19, 2025, https://nordvpn.com/blog/whatsapp-scams/
Making calls to Indonesia from the U.S., accessed July 19, 2025, https://telnyx.com/resources/how-to-call-indonesia
How to Call Indonesia From USA – JustCall, accessed July 19, 2025, https://justcall.io/hub/international-calling/calling-indonesia-from-usa/
How to Call Indonesia from the U.S. | Indonesia Country Code – Vonage, accessed July 19, 2025, https://www.vonageforhome.com/blog/how-to-call-indonesia-from-the-usa/
Telephone codes for mobile operators in Bali, accessed July 19, 2025, https://bali.live/p/telephone-codes-for-mobile-operators-in-bali
Calling Codes For Indonesia: A Comprehensive Guide – Elevate Pay, accessed July 19, 2025, https://www.elevatepay.co/br/blog/calling-codes-for-indonesia
T-Mobile International Calling Plans, Add-on, and Rates | WhistleOut, accessed July 19, 2025, https://www.whistleout.com/CellPhones/Guides/international-calls-with-t-mobile
Per-minute calling rates – T-Mobile Prepaid, accessed July 19, 2025, https://prepaid.t-mobile.com/connect/international-calling-rates
International Calling: Pay Per Minute – Verizon, accessed July 19, 2025, https://www.verizon.com/plans/international/international-calling/pay-per-minute/
AT&T international data & roaming & calling plans – BOSS Revolution, accessed July 19, 2025, https://www.bossrevolution.com/en-us/blog/att-international-data-plans
Our Best Unlimited International Calling Plan & Affordable Rates | T-Mobile, accessed July 19, 2025, https://www.t-mobile.com/coverage/international-calling
International Calling – Verizon, accessed July 19, 2025, https://www.verizon.com/plans/international/international-calling/
Global Choice – Prepaid Calling to Other Countries – Verizon, accessed July 19, 2025, https://www.verizon.com/plans/prepaid/international-global-choice/
International Long Distance Calling Plans & Rates | AT&T, accessed July 19, 2025, https://www.att.com/international/long-distance/
AT&T International Calling Plans – HTC Inc., accessed July 19, 2025, https://www.htcinc.net/mobile/international-options/
How to call Indonesia from USA – Viber Out, accessed July 19, 2025, https://account.viber.com/en/how-to-call-indonesia?from=usa
International Plans | Traveling Abroad without Roaming Fees – T-Mobile, accessed July 19, 2025, https://www.t-mobile.com/cell-phone-plans/international-roaming-plans
Indosat – Wikipedia, accessed July 19, 2025, https://en.wikipedia.org/wiki/Indosat
Telco in Numbers: Indonesia. I have posted bits of information about… | by Khrisnaresa Adytia | A View from Pluto | Medium, accessed July 19, 2025, https://medium.com/view-from-pluto/telco-in-numbers-indonesia-fc79c3c8027e
Indosat Ooredoo Hutchison records stellar growth – TelecomTV, accessed July 19, 2025, https://www.telecomtv.com/content/access-evolution/indosat-ooredoo-hutchison-records-stellar-growth-50276/
Indosat Ooredoo | Indonesia Investments, accessed July 19, 2025, https://www.indonesia-investments.com/business/indonesian-companies/indosat-ooredoo/item200?
Indosat Ooredoo Hutchison Company Profile – Office Locations, Competitors, Financials, Employees, Key People, News, accessed July 19, 2025, https://craft.co/indosat-ooredoo
Digital 2024: Indonesia — DataReportal – Global Digital Insights, accessed July 19, 2025, https://datareportal.com/reports/digital-2024-indonesia
Mobile Operating System Market Share Indonesia | Statcounter Global Stats, accessed July 19, 2025, https://gs.statcounter.com/os-market-share/mobile/indonesia
Research: The most popular messaging apps by country – Infobip, accessed July 19, 2025, https://www.infobip.com/blog/most-popular-messaging-apps-by-country
The most popular messaging apps in the world by country – Sinch, accessed July 19, 2025, https://sinch.com/blog/most-popular-messaging-apps-by-country/
Truecaller Around the Globe – Part 5: The Mobile Revolution in Indonesia, accessed July 19, 2025, https://www.truecaller.com/blog/news/truecaller-around-the-globe-part-5-the-mobile-revolution-in-indonesia

+62 857: The Ultimate Guide to Indonesia’s Country Code, Scam Calls, and Calling from the U.S.

What is the +62 857 Number? A Direct Answer