Prefix overview
Phone numbers in prefix 331-304
This page covers the 331-304 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
331-304
RATE CENTER
BARTLETT
CARRIER
T-MOBILE USA, INC.
IL
Prefix range
The prefix 331-304 includes numbers from 3313040000 to 3313049999.
This range is associated with the BARTLETT rate center and was originally assigned to T-MOBILE USA, INC..
Numbers in this prefix
20 numbers