Prefix overview
Phone numbers in prefix 857-388
This page covers the 857-388 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
857-388
RATE CENTER
SOMERVILLE
CARRIER
COMMIO, LLC
MA
Prefix range
The prefix 857-388 includes numbers from 8573880000 to 8573889999.
This range is associated with the SOMERVILLE rate center and was originally assigned to COMMIO, LLC.
Numbers in this prefix
20 numbers