Phone numbers in Guaynabo, Puerto Rico
Guaynabo has 51 phone prefixes in area codes 787, 939.
Biggest holders: Liberty Mobile Puerto Rico, Puerto Rico Tel, Optivon Telecommunications Services. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 84%
- Local phone company 14%
- Phone company 2%
Every prefix in Guaynabo
Search the first six digits of a number in this list. If it's here, the number started in Guaynabo with the carrier shown. If it isn't, check the Puerto Rico page or look the number up.
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.