Prefix overview
Phone numbers in prefix 406-403
This page covers the 406-403 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
406-403
RATE CENTER
GREATFALLS
CARRIER
ONVOY, LLC - MT
MT
Prefix range
The prefix 406-403 includes numbers from 4064030000 to 4064039999.
This range is associated with the GREATFALLS rate center and was originally assigned to ONVOY, LLC - MT.
Numbers in this prefix
20 numbers