Prefix 313-397 — Detroit Zone 04, MI
- Area code
- 313
- Prefix (NXX)
- 397
- Rate center
- Detroit Zone 04
- State
- Michigan
- Time zone
- Eastern
- Code holder
- COMCAST IP PHONE, LLC
- OCN
- 318J
- Pooled
- Yes (thousands-block pooling)
- Assigned
- 2006-02-01
- LATA
- 340
313-397 identifies a block of numbers in Detroit Zone 04, MI, within the 313 area code. Every US prefix is tied to exactly one rate center; this one is Detroit Zone 04.
The rate center lies in the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area. The serving LATA is 340. Local time follows the Eastern zone.
Treat the on-screen number as a hint, not evidence — 313-397 can be spoofed like any US prefix. If a call feels off, verify through an official callback number and file a complaint with the FCC or FTC.
NANPA's central-office code records list COMCAST IP PHONE, LLC (OCN 318J) as the code holder, assigned February 1, 2006. Because 313-397 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 313-394 | Detroit Zone 01 | MICHIGAN BELL TEL CO |
| 313-395 | Detroit Zone 06 | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC |
| 313-396 | Detroit Zone 01 | MICHIGAN BELL TEL CO |
| 313-398 | Detroit Zone 01 | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC |
| 313-399 | Detroit Zone 05 | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC |
| 313-400 | Detroit Zone 05 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI |
FAQ
Where is 313-397 located?
The prefix is assigned to the Detroit Zone 04 rate center in MI, area code 313. It is part of the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area.
Which company owns 313-397 numbers?
COMCAST IP PHONE, LLC 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 313-397 safe to answer?
The prefix itself says nothing about the caller. Legitimate Detroit Zone 04 businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.