Prefix overview
Phone numbers in prefix 281-350
This page covers the 281-350 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
281-350
RATE CENTER
SPRING
CARRIER
SOUTHWESTERN BELL
TX
Prefix range
The prefix 281-350 includes numbers from 2813500000 to 2813509999.
This range is associated with the SPRING rate center and was originally assigned to SOUTHWESTERN BELL.
Numbers in this prefix
20 numbers