Prefix overview
Phone numbers in prefix 406-409
This page covers the 406-409 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
406-409
RATE CENTER
BILLINGS
CARRIER
CSC WIRELESS, LLC
MT
Prefix range
The prefix 406-409 includes numbers from 4064090000 to 4064099999.
This range is associated with the BILLINGS rate center and was originally assigned to CSC WIRELESS, LLC.
Numbers in this prefix
20 numbers