NPA-NXX - 903-503

This is the 903-503 subcode (NPA-NXX) prefix page. Follow a prefix to find the number you are looking for. We divide our pages up to make them more user friendly to navigate!

1. Area Codes
2. 903
3. 903-503

The 903-503 subcode mainly covers Marshall in Harrison county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Texas state. Many of the numbers in this subcode are Cellular (Dedicated) registered to T-mobile. We hear they employ a large number of people in the Texas office.
Recently there have been an increase in reported calls, we've had over 65631 comments across our systems for the 903-503 subcode.