Prefix overview
Phone numbers in prefix 857-357
This page covers the 857-357 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
857-357
RATE CENTER
CAMBRIDGE
CARRIER
MEGAPHONE, INC.
MA
Prefix range
The prefix 857-357 includes numbers from 8573570000 to 8573579999.
This range is associated with the CAMBRIDGE rate center and was originally assigned to MEGAPHONE, INC..
Numbers in this prefix
20 numbers