Prefix 210-551 — San Antonio, TX

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

Numbers in the 210-551 prefix are registered to the San Antonio rate center in TX, inside area code 210. The prefix is the second block of a ten-digit US number (210-551-XXXX) and pins the number to a billing locality.

Code-holder of record: NEW CINGULAR WIRELESS PCS, LLC - IL (OCN 6534), assigned March 25, 2011. The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 210-551 numbers may be served by different companies.

The rate center lies in the San Antonio-New Braunfels, TX Metropolitan Statistical Area. The serving LATA is 566. Local time follows the Central zone.

Spoofing means this prefix on your screen doesn't guarantee a San Antonio caller. Verify independently before trusting a request for money or data.

Neighboring prefixes

FAQ

Where is 210-551 located?

The prefix is assigned to the San Antonio rate center in TX, area code 210. It is part of the San Antonio-New Braunfels, TX Metropolitan Statistical Area.

Which company owns 210-551 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 210-551 safe to answer?

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