Prefix overview
Phone numbers in prefix 203-399
This page covers the 203-399 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
203-399
RATE CENTER
STAMFORD
CARRIER
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT
CT
Prefix range
The prefix 203-399 includes numbers from 2033990000 to 2033999999.
This range is associated with the STAMFORD rate center and was originally assigned to MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT.
Numbers in this prefix
20 numbers