Prefix overview
Phone numbers in prefix 309-428
This page covers the 309-428 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
309-428
RATE CENTER
ROCKISLAND
CARRIER
T-MOBILE USA, INC.
IL
Prefix range
The prefix 309-428 includes numbers from 3094280000 to 3094289999.
This range is associated with the ROCKISLAND rate center and was originally assigned to T-MOBILE USA, INC..
Numbers in this prefix
20 numbers