Prefix overview
Phone numbers in prefix 303-356
This page covers the 303-356 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
303-356
RATE CENTER
DENVER
CARRIER
T-MOBILE USA, INC.
CO
Prefix range
The prefix 303-356 includes numbers from 3033560000 to 3033569999.
This range is associated with the DENVER rate center and was originally assigned to T-MOBILE USA, INC..
Numbers in this prefix
20 numbers