Prefix overview
Phone numbers in prefix 312-401
This page covers the 312-401 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
312-401
RATE CENTER
CHICGOZN01
CARRIER
NEW CINGULAR WIRELESS PCS, LLC - IL
IL
Prefix range
The prefix 312-401 includes numbers from 3124010000 to 3124019999.
This range is associated with the CHICGOZN01 rate center and was originally assigned to NEW CINGULAR WIRELESS PCS, LLC - IL.
Numbers in this prefix
20 numbers