Prefix overview
Phone numbers in prefix 737-221
This page covers the 737-221 prefix in the United States. It shows where numbers come from, which carrier is linked to the range, and how this block is structured.
If you are looking for a specific number, you can continue to its dedicated phone page. Otherwise, this page helps you understand the broader number block behind it.
PREFIX
737-221
RATE CENTER
SAN MARCOS
CARRIER
T-MOBILE USA, INC.
TX
Prefix range
The prefix 737-221 includes numbers from 7372210000 to 7372219999.
This range is associated with the SAN MARCOS rate center and was originally assigned to T-MOBILE USA, INC..
Numbers in this prefix
20 numbers