NPA-NXX - 787-399

This is the 787-399 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. 787
3. 787-399

The 787-399 subcode mainly covers Rio Piedras in San Juan county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Puerto Rico state. Many of the numbers in this subcode are Cellular (Dedicated) registered to At&t Mobility. We hear they employ a large number of people in the Puerto Rico office.
Recently there have been an increase in reported calls, we've had over 395326 comments across our systems for the 787-399 subcode.