Prefix overview
Phone numbers in prefix 310-400
This page covers the 310-400 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
310-400
RATE CENTER
CMTN GRDN
CARRIER
T-MOBILE USA, INC.
CA
Prefix range
The prefix 310-400 includes numbers from 3104000000 to 3104009999.
This range is associated with the CMTN GRDN rate center and was originally assigned to T-MOBILE USA, INC..
Numbers in this prefix
20 numbers