Prefix overview
Phone numbers in prefix 310-399
This page covers the 310-399 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
310-399
RATE CENTER
SNMN SNMN
CARRIER
FRONTIER CALIFORNIA INC.
CA
Prefix range
The prefix 310-399 includes numbers from 3103990000 to 3103999999.
This range is associated with the SNMN SNMN rate center and was originally assigned to FRONTIER CALIFORNIA INC..
Numbers in this prefix
20 numbers