Prefix 210-544 — San Antonio, TX

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

210-544 identifies a block of numbers in San Antonio, TX, within the 210 area code. Every US prefix is tied to exactly one rate center; this one is San Antonio.

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.

Treat the on-screen number as a hint, not evidence — 210-544 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 T-MOBILE USA, INC. (OCN 6529) as the code holder, assigned September 18, 2007. Because 210-544 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.

Neighboring prefixes

FAQ

Where is 210-544 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 210-544 numbers?

T-MOBILE USA, 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 210-544 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.