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

BREA prefixes in area code 657

NANPA records 8 assigned NXX blocks to rate center BREA in area code 657, 1.1% of the 703 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. 4 holders hold those blocks, the largest being NEW CINGULAR WIRELESS PCS, LLC (4), T-MOBILE USA, INC. (2), FRACTEL, LLC (1). The earliest assignment on record here is 2014-09-03 and the most recent 2024-08-06. 8 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 714 – overlay codes cover the same geography, so a rate center is served by all of them.

8 assigned blocks – 1.1% of 657
4 holders of record
8 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
657-246 T-Mobile T-MOBILE USA, INC. 2014-09-03 yes yes
657-286 AT&T NEW CINGULAR WIRELESS PCS, LLC 2015-09-11 yes yes
657-341 T-Mobile T-MOBILE USA, INC. 2016-06-29 yes yes
657-478 AT&T NEW CINGULAR WIRELESS PCS, LLC 2017-06-26 yes yes
657-530 AT&T NEW CINGULAR WIRELESS PCS, LLC 2021-10-26 yes yes
657-588 FRACTEL, LLC 2020-06-01 yes yes
657-671 COMMIO, LLC 2023-08-10 yes yes
657-759 AT&T NEW CINGULAR WIRELESS PCS, LLC 2024-08-06 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
NEW CINGULAR WIRELESS PCS, LLC AT&T 4 50%
T-MOBILE USA, INC. T-Mobile 2 25%
FRACTEL, LLC – 1 12.5%
COMMIO, LLC – 1 12.5%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to BREA in area code 657?

8 blocks: 246, 286, 341, 478, 530, 588, 671, 759. The table above gives the holder of each.

Which carriers have numbers in BREA?

NEW CINGULAR WIRELESS PCS, LLC (4 blocks), T-MOBILE USA, INC. (2 blocks), FRACTEL, LLC (1 block), COMMIO, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is BREA 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 657

All 703 prefixes in 657