Prefix overview
Phone numbers in prefix 773-399
This page covers the 773-399 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
773-399
RATE CENTER
CHICGOZN03
CARRIER
ILLINOIS BELL TEL CO
IL
Prefix range
The prefix 773-399 includes numbers from 7733990000 to 7733999999.
This range is associated with the CHICGOZN03 rate center and was originally assigned to ILLINOIS BELL TEL CO.
Numbers in this prefix
20 numbers