+62 857 is an Indonesian mobile number on the Indosat Ooredoo Hutchison network. The 857 prefix identifies the carrier, while +62 confirms the number is registered in Indonesia.
If you've received a call, text, or WhatsApp message from a +62 857 number, you're dealing with someone using Indonesia's second-largest mobile network. But is it legitimate? Here's everything you need to know.
What Does +62 857 Mean?
Breaking down the number:
+62 — Indonesia's country code
857 — Indosat Ooredoo Hutchison carrier prefix
Remaining digits — The subscriber's personal number
Indosat operates under several brand names including IM3, Mentari, and Matrix. The 857 prefix falls under the IM3 prepaid brand, one of Indonesia's most popular mobile services with tens of millions of users.
Not inherently. The 857 prefix belongs to a legitimate Indonesian carrier serving millions of customers. However, scammers frequently use Indosat numbers — including the 857 prefix — because:
SIM cards are inexpensive: Indonesian prepaid SIMs cost very little and require minimal verification, making them attractive for fraudulent operations.
VoIP numbers are accessible: Anyone worldwide can purchase Indonesian virtual numbers online, displaying +62 857 as their caller ID regardless of actual location.
High volume provides cover: With millions of legitimate 857 users, scam numbers blend into normal traffic.
Warning Signs From +62 857 Numbers
Be cautious if a +62 857 contact:
Reaches out unexpectedly with job offers or investment opportunities
Asks for personal information, banking details, or verification codes
Creates urgency ("act now," "limited time," "your account is at risk")
Requests payment through unusual methods (gift cards, crypto, wire transfers)
Refuses video calls or verifiable identity confirmation
Sends links to unfamiliar websites
Signs It Might Be Legitimate
A +62 857 number could be genuine if:
You have existing connections to Indonesia
The caller references specific details only a real contact would know
They're willing to verify identity through video call
The context makes sense (travel booking, business contact, online purchase)
You can find the number associated with a legitimate business online
About Indosat Ooredoo Hutchison
Indosat is Indonesia's second-largest telecommunications provider, formed through the 2022 merger of Indosat Ooredoo and Hutchison 3 Indonesia.
Key facts:
Subscribers: 100+ million
Market share: Approximately 25-30% of Indonesian mobile users
Network: 4G LTE coverage across major Indonesian islands
Brands: IM3 (prepaid), Tri (prepaid), Matrix (postpaid)
The company serves both consumer and enterprise markets, with significant presence in urban centres like Jakarta, Surabaya, and Bandung.
All Indosat Mobile Prefixes
The 857 prefix is just one of several assigned to Indosat. Here's the complete list:
If you see any number beginning with +62 followed by these prefixes, you're looking at an Indosat subscriber.
How +62 857 Compares to Other Prefixes
Different prefixes indicate different Indonesian carriers:
The prefix alone doesn't indicate legitimacy — all carriers have both genuine users and numbers exploited by scammers.
If you need to confirm whether a +62 857 contact is legitimate:
Check Online Databases
Several websites track reported scam numbers. Search the full number (with +62) to see if others have flagged it.
Request Video Verification
Scammers avoid video calls because they can't maintain fake identities. A willingness to video chat suggests genuine contact.
Verify Business Claims
If someone claims to represent a company, locate that company's official contact information through independent research — not links they provide.
Trust Your Instincts
If something feels wrong, it probably is. Legitimate contacts don't create artificial urgency or pressure you for immediate decisions.
Calling +62 857 Numbers
If you need to call a +62 857 number from outside Indonesia:
From the United States
plain text
011 + 62 + 857 + subscriber number
Example: 011-62-857-1234-5678
From the United Kingdom
plain text
00 + 62 + 857 + subscriber number
Example: 00-62-857-1234-5678
From Any Mobile Phone
plain text
+ 62 + 857 + subscriber number
Example: +62-857-1234-5678
Standard carrier rates for calls to Indonesian mobiles often exceed $2 per minute. For frequent calling, browser-based calling offers significant savings with transparent per-minute pricing.
+62 857 belongs to Indosat Ooredoo Hutchison, specifically the IM3 prepaid brand. Indosat is Indonesia's second-largest mobile carrier with over 100 million subscribers.
Is +62 857 safe to answer?
Answering a call won't harm your device. The risk comes from engaging with scammers, sharing personal information, or calling back premium-rate numbers. If the caller seems suspicious, hang up without providing any details.
Why do I keep getting messages from +62 857?
Your number may have been randomly generated by automated systems, leaked in a data breach, or scraped from online sources. Scammers contact thousands of numbers hoping some will respond. Block individual numbers and avoid responding to suspicious messages.
Can I block all +62 857 numbers?
Most phones can't block entire prefixes, only individual numbers. However, you can enable "silence unknown callers" to send unfamiliar international numbers to voicemail, or use third-party apps that filter by region.
Is +62 857 only used for scams?
No. Millions of legitimate Indonesian mobile users have 857 numbers. The prefix itself is completely legitimate — it's simply been exploited by scammers alongside numbers from every carrier. Don't assume all 857 contacts are fraudulent, but do verify unexpected communications.
Summary
+62 857 is an Indonesian mobile number on the Indosat Ooredoo Hutchison network (IM3 brand). The prefix identifies a legitimate carrier serving millions of customers across Indonesia.
However, like all Indonesian mobile prefixes, 857 numbers are sometimes used for scam operations. The key differentiators:
Likely legitimate if:
You have Indonesian contacts expecting to hear from you
The caller can verify their identity
Context makes sense for the communication
Likely suspicious if:
Unexpected contact with job/investment offers
Requests for personal or financial information
Pressure tactics and artificial urgency
Refusal to verify identity
When in doubt, verify independently before engaging. Block and report numbers that display clear scam behaviour.
