Prefix 313-439 — Detroit Zone 05, MI

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

A phone number starting 313-439 was issued in the Detroit Zone 05 rate center of MI — part of area code 313.

Code-holder of record: NEW CINGULAR WIRELESS PCS, LLC - IL (OCN 6534), assigned November 7, 2023. The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 313-439 numbers may be served by different companies.

A scammer can display 313-439 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 05 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 313-439 located?

The prefix is assigned to the Detroit Zone 05 rate center in MI, area code 313. It is part of the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area.

Which company owns 313-439 numbers?

NEW CINGULAR WIRELESS PCS, LLC - IL 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 313-439 safe to answer?

The prefix itself says nothing about the caller. Legitimate Detroit Zone 05 businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.