Prefix overview
Phone numbers in prefix 840-256
This page covers the 840-256 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
840-256
RATE CENTER
UPLAND
CARRIER
T-MOBILE USA, INC.
CA
Prefix range
The prefix 840-256 includes numbers from 8402560000 to 8402569999.
This range is associated with the UPLAND rate center and was originally assigned to T-MOBILE USA, INC..
Numbers in this prefix
20 numbers