Phone numbers in Guayanilla, Puerto Rico
Guayanilla has 7 phone prefixes in area codes 787, 939.
Biggest holders: T-Mobile (including Sprint), Liberty Mobile Puerto Rico, Optivon Telecommunications Services. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 71%
- Local phone company 14%
- Phone company 14%
Every prefix in Guayanilla
Search the first six digits of a number in this list. If it's here, the number started in Guayanilla with the carrier shown. If it isn't, check the Puerto Rico page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 787-301 | Optivon Telecommunications Services | Phone company | – |
| 787-543 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 787-606 | T-Mobile (including Sprint) | Mobile carrier | 2004 |
| 787-835 | Puerto Rico Tel | Local phone company | – |
| 787-927 | Liberty Mobile Puerto Rico | Mobile carrier | – |
| 787-973 | Liberty Mobile Puerto Rico | Mobile carrier | 2007 |
| 939-398 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.