Prefix 313-338 — Detroit Zone 01, MI

NANPA CO code assignment, current as of July 28, 2026.

A phone number starting 313-338 was issued in the Detroit Zone 01 rate center of MI — part of area code 313.

Code-holder of record: MICHIGAN BELL TEL CO (OCN 9323), assigned October 11, 2011. The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 313-338 numbers may be served by different companies.

A scammer can display 313-338 without ever touching MI. When in doubt, end the call and reach the company or agency through its official website; unwanted robocalls belong in the FTC's fraud report queue.

Detroit Zone 01 is part of the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area. For routing purposes it sits in LATA 340. Numbers here keep Eastern time.

Neighboring prefixes

FAQ

Where is 313-338 located?

The prefix is assigned to the Detroit Zone 01 rate center in MI, area code 313. It is part of the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area.

Which company owns 313-338 numbers?

MICHIGAN BELL TEL CO 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 313-338 safe to answer?

The prefix itself says nothing about the caller. Legitimate Detroit Zone 01 businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.