+62 857 Number: What Network Is It and Is It Safe?
+62 857 is an Indosat mobile number from Indonesia. Find out if it's safe, how to verify the caller, and what to do if you receive contact from this prefix.
+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:
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.
Is +62 857 a Scam Number?
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:
Signs It Might Be Legitimate
A +62 857 number could be genuine if:
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:
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.
For more on other specific prefixes, see our guides on +62 831 numbers and +62 838 WhatsApp numbers.
What to Do If a +62 857 Number Contacts You
On WhatsApp
For detailed guidance, see WhatsApp Messages From +62: Scam or Real?
Phone Calls
For more on handling calls, see Missed Call From +62: What to Do
Verifying a +62 857 Number
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
011 + 62 + 857 + subscriber number
Example: 011-62-857-1234-5678
From the United Kingdom
00 + 62 + 857 + subscriber number
Example: 00-62-857-1234-5678
From Any Mobile Phone
+ 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.
Check Indonesia calling rates →
Frequently Asked Questions
What carrier is +62 857?
+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:
Likely suspicious if:
When in doubt, verify independently before engaging. Block and report numbers that display clear scam behaviour.
Related Guides:
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