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

HUMACAO prefixes in area code 787

NANPA records 10 assigned NXX blocks to rate center HUMACAO in area code 787, 1.3% 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. 6 holders hold those blocks, the largest being PUERTO RICO TEL. CO. (3), METROPCS, INC. (2), LIBERTY MOBILE PUERTO RICO INC. (2). The earliest assignment on record here is 2001-06-20 and the most recent 2005-11-29. 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.

10 assigned blocks – 1.3% of 787
6 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
787-206 PUERTO RICO TELCO DBA CLARO PUERTO RICO – no yes
787-285 PUERTO RICO TEL. CO. – no yes
787-389 OPTIVON TELECOMMUNICATIONS SERVICES, INC. - PR – no yes
787-559 T-Mobile METROPCS, INC. 2003-02-18 yes yes
787-656 Liberty LIBERTY MOBILE PUERTO RICO INC. – no yes
787-676 T-Mobile SUNCOM DBA T-MOBILE USA 2004-06-15 yes yes
787-719 Liberty LIBERTY MOBILE PUERTO RICO INC. 2005-11-29 yes yes
787-850 PUERTO RICO TEL. CO. – no yes
787-852 PUERTO RICO TEL. CO. – no yes
787-914 T-Mobile METROPCS, INC. 2001-06-20 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
PUERTO RICO TEL. CO. – 3 30%
METROPCS, INC. T-Mobile 2 20%
LIBERTY MOBILE PUERTO RICO INC. Liberty 2 20%
PUERTO RICO TELCO DBA CLARO PUERTO RICO – 1 10%
OPTIVON TELECOMMUNICATIONS SERVICES, INC. - PR – 1 10%
SUNCOM DBA T-MOBILE USA T-Mobile 1 10%

Frequently asked

Which prefixes belong to HUMACAO in area code 787?

10 blocks: 206, 285, 389, 559, 656, 676, 719, 850, 852, 914. The table above gives the holder of each.

Which carriers have numbers in HUMACAO?

PUERTO RICO TEL. CO. (3 blocks), METROPCS, INC. (2 blocks), LIBERTY MOBILE PUERTO RICO INC. (2 blocks), PUERTO RICO TELCO DBA CLARO PUERTO RICO (1 block), OPTIVON TELECOMMUNICATIONS SERVICES, INC. - PR (1 block), SUNCOM DBA T-MOBILE USA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is HUMACAO 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