Prefix 313-257 — Detroit Zone 03, MI
- Area code
- 313
- Prefix (NXX)
- 257
- Rate center
- Detroit Zone 03
- State
- Michigan
- Time zone
- Eastern
- Code holder
- METROPCS, INC.
- OCN
- 5562
- Pooled
- Yes (thousands-block pooling)
- Assigned
- 2018-09-20
- LATA
- 340
The 313-257 prefix belongs to area code 313 and is anchored to the Detroit Zone 03 rate center (MI). In NANP terms, the prefix — or NXX — determines the rate center a number is billed against.
Detroit Zone 03 is part of the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area. For routing purposes it sits in LATA 340. Numbers here keep Eastern time.
NANPA's central-office code records list METROPCS, INC. (OCN 5562) as the code holder, assigned September 20, 2018. Because 313-257 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.
Caller ID showing 313-257 is not proof the call came from Detroit Zone 03: spoofing and porting both detach numbers from their origin. To verify a caller, hang up and dial the organization's published number, and report suspicious calls to the FTC.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 313-254 | Detroit Zone 06 | LEVEL 3 COMMUNICATIONS, LLC - MI |
| 313-255 | Detroit Zone 05 | MICHIGAN BELL TEL CO |
| 313-256 | Detroit Zone 01 | MICHIGAN BELL TEL CO |
| 313-258 | Detroit Zone 06 | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC |
| 313-259 | Detroit Zone 01 | MICHIGAN BELL TEL CO |
| 313-260 | Detroit Zone 05 | AMERICAN MESSAGING SERVICES, LLC |
FAQ
Where is 313-257 located?
The prefix is assigned to the Detroit Zone 03 rate center in MI, area code 313. It is part of the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area.
Which company owns 313-257 numbers?
METROPCS, INC. holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.
Is a call from 313-257 safe to answer?
The prefix itself says nothing about the caller. Legitimate Detroit Zone 03 businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.