NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

GUAYANILLA prefixes in area code 787

NANPA records 6 assigned NXX blocks to rate center GUAYANILLA in area code 787, 0.8% of the 777 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 5 holders hold those blocks, the largest being LIBERTY MOBILE PUERTO RICO INC. (2), OPTIVON TELECOMMUNICATIONS SERVICES, INC. - PR (1), METROPCS, INC. (1). The earliest assignment on record here is 2001-09-12 and the most recent 2007-09-17. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area code 939 – overlay codes cover the same geography, so a rate center is served by all of them.

6 assigned blocks – 0.8% of 787
5 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
787-301 OPTIVON TELECOMMUNICATIONS SERVICES, INC. - PR – no yes
787-543 T-Mobile METROPCS, INC. 2001-09-12 yes yes
787-606 T-Mobile SUNCOM DBA T-MOBILE USA 2004-10-19 yes yes
787-835 PUERTO RICO TEL. CO. – no yes
787-927 Liberty LIBERTY MOBILE PUERTO RICO INC. – yes yes
787-973 Liberty LIBERTY MOBILE PUERTO RICO INC. 2007-09-17 yes yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Who holds the blocks

HolderBrandBlocksShare here
LIBERTY MOBILE PUERTO RICO INC. Liberty 2 33.3%
OPTIVON TELECOMMUNICATIONS SERVICES, INC. - PR – 1 16.7%
METROPCS, INC. T-Mobile 1 16.7%
SUNCOM DBA T-MOBILE USA T-Mobile 1 16.7%
PUERTO RICO TEL. CO. – 1 16.7%

Frequently asked

Which prefixes belong to GUAYANILLA in area code 787?

6 blocks: 301, 543, 606, 835, 927, 973. The table above gives the holder of each.

Which carriers have numbers in GUAYANILLA?

LIBERTY MOBILE PUERTO RICO INC. (2 blocks), OPTIVON TELECOMMUNICATIONS SERVICES, INC. - PR (1 block), METROPCS, INC. (1 block), SUNCOM DBA T-MOBILE USA (1 block), PUERTO RICO TEL. CO. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is GUAYANILLA a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 787

All 777 prefixes in 787