357 Area Code Guide – United States Map, Zip & Scams

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📞 357 Area Code — Quick Reference
📍 LocationUnknown, United States
🕐 Time ZoneMultiple (Varies)
🗓️ StatusActive — Geographic

Numbers starting with 357 connect to Unknown and nearby areas in United States. Whether you received an unexpected call from this number or you’re trying to figure out where a 357 number is based, this guide covers the exact location, time zone, spam reputation, blocking instructions, and which cities fall under this code.

📍 Where Is the 357 Area Code Located?

The 357 area code is located in United States, primarily serving Unknown and the surrounding region. It’s a standard geographic area code under the North American Numbering Plan (NANP). Keep in mind that mobile number portability means someone could carry a 357 number with them after moving — so the code tells you where the number was issued, not necessarily where the person is right now.

357 Area Code — Location Details
State/ProvinceUnited States (US)
Major CityUnknown
CountryUnited States (+1)
Time ZoneMultiple (Varies)
TypeGeographic — Standard
NANPA StatusActive

🕐 357 Area Code Time Zone

The 357 area code operates in the Multiple Time Zone (Varies). Here’s how it compares to other US time zones:

Time ZoneDifference from 357
Eastern TimeSame time
Central Time-1 hour
Mountain Time-2 hours
Pacific Time-3 hours
💡 Calling Tip: Reach someone in the 357 area between 10 AM – 4 PM their local time for the best chance of an answer. Calls outside those hours are more likely to be screened or ignored.

🛡️ Is 357 Area Code Spam or Scam?

The 357 area code is completely legitimate, covering real residents and businesses in Unknown. However, spam callers love spoofing well-known area codes like 357 because you’re more likely to pick up a local-looking number. If an unexpected 357 caller asks for personal info or payment, that’s your red flag.

⚠️ Red Flag: If a 357 caller demands immediate payment via gift cards, wire transfer, or crypto — hang up. No legitimate organization uses these methods. Verify by calling the company’s official number directly.

How to verify: Don’t call back the number — look up the official number for whatever organization the caller claimed to represent and call that instead. Google the full 10-digit number in quotes to check if others have reported it as spam.

📵 How to Block 357 Spam Calls & Texts

Block on iPhone

  1. Open Phone → tap Recents
  2. Tap ⓘ next to the 357 spam number
  3. Scroll down → “Block this Caller”
  4. Silence all unknowns: Settings → Phone → Silence Unknown Callers → ON

Block on Android

  1. Open Phone → find the 357 number
  2. Tap ⋮ menu → “Block number”
  3. For broader blocking: Settings → Blocked numbers → Unknown toggle ON

Report Spam

  1. Forward spam texts to 7726 (SPAM)
  2. Report at reportfraud.ftc.gov
  3. Register at donotcall.gov or call 1-888-382-1222

🔍 Who Called from 357? Reverse Lookup

  1. Google the full 10-digit number in quotes — catches ~70% of unknown callers
  2. Check Whitepages.com or Truecaller.com
  3. Search 800notes.com for community reports
  4. No voicemail left? Almost certainly spam — legitimate callers leave messages
⚠️ One-Ring Scam: If a 357 number rings once and hangs up, do NOT call back. This scam connects you to a premium-rate line that charges your bill.

🔗 Nearby Area Codes

CodeLocationTime Zone
771Unknown, United StatesMultiple
448Unknown, United StatesMultiple
645Unknown, United StatesMultiple
728Unknown, United StatesMultiple
227Unknown, United StatesMultiple

❓ 357 Area Code — FAQ

What state is 357 area code in?
The 357 area code is in United States, serving Unknown and surrounding areas.
What city does 357 cover?
357 primarily covers Unknown and nearby communities in United States.
Is 357 toll-free?
No. 357 is a geographic area code. Toll-free codes are 800, 833, 844, 855, 866, 877, 888.
What time zone is 357?
Multiple (Varies).
Is 357 a scam?
357 is legitimate — it serves real people in Unknown. But scammers may spoof 357 numbers. Verify suspicious callers independently.
Why do I keep getting 357 calls?
Repeated 357 calls without a known contact are likely robocalls. Use your phone’s Silence Unknown Callers feature.
Can I get a 357 number remotely?
Yes — VoIP services like Google Voice offer 357 numbers regardless of where you live.
Is 357 cell or landline?
357 covers both. US area codes don’t distinguish between mobile and landline.
How do I block 357 calls?
iPhone: Settings → Phone → Silence Unknown Callers. Android: Phone → Settings → Blocked numbers. For area-code blocking, use Truecaller or RoboKiller.

🔗 Related Area Code Guides

Updated April 2026 · Data from NANPA & FCC · areacodess.org/