Prefix overview
Phone numbers in prefix 231-403
This page covers the 231-403 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
231-403
RATE CENTER
WILLIAMSBG
CARRIER
AT&T ENTERPRISES, LLC
MI
Prefix range
The prefix 231-403 includes numbers from 2314030000 to 2314039999.
This range is associated with the WILLIAMSBG rate center and was originally assigned to AT&T ENTERPRISES, LLC.
Numbers in this prefix
20 numbers