Prefix overview
Phone numbers in prefix 310-303
This page covers the 310-303 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
310-303
RATE CENTER
REDONDO
CARRIER
PACIFIC BELL (COMPETITIVE)
CA
Prefix range
The prefix 310-303 includes numbers from 3103030000 to 3103039999.
This range is associated with the REDONDO rate center and was originally assigned to PACIFIC BELL (COMPETITIVE).
Numbers in this prefix
20 numbers