Prefix overview
Phone numbers in prefix 603-405
This page covers the 603-405 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
603-405
RATE CENTER
SOMERSWTH
CARRIER
TELEPORT COMMUNICATIONS AMERICA, LLC - NH
NH
Prefix range
The prefix 603-405 includes numbers from 6034050000 to 6034059999.
This range is associated with the SOMERSWTH rate center and was originally assigned to TELEPORT COMMUNICATIONS AMERICA, LLC - NH.
Numbers in this prefix
20 numbers