WESTMINSTR prefixes in area code 657
NANPA records 60 assigned NXX blocks to rate center WESTMINSTR in area code 657, 8.5% 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. 12 holders hold those blocks, the largest being CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (33), T-MOBILE USA, INC. (7), NEW CINGULAR WIRELESS PCS, LLC (7). The earliest assignment on record here is 2008-08-08 and the most recent 2026-09-23. 60 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 codes 351, 410, 419, 443 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 657-200 | T-Mobile METROPCS NETWORKS, LLC | 2008-08-08 | yes | yes |
| 657-227 | Charter TWC IP ENABLED SERVICES, LLC | 2014-04-14 | yes | yes |
| 657-257 | T-Mobile T-MOBILE USA, INC. | 2015-09-11 | yes | yes |
| 657-271 | T-Mobile T-MOBILE USA, INC. | 2015-05-05 | yes | yes |
| 657-277 | Peerless PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 2015-11-13 | yes | yes |
| 657-288 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2015-12-07 | yes | yes |
| 657-302 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2016-02-26 | yes | yes |
| 657-306 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2016-03-11 | yes | yes |
| 657-318 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2016-04-11 | yes | yes |
| 657-334 | T-Mobile T-MOBILE USA, INC. | 2016-06-10 | yes | yes |
| 657-340 | T-Mobile T-MOBILE USA, INC. | 2016-08-30 | yes | yes |
| 657-349 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2016-11-18 | yes | yes |
| 657-350 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2016-11-18 | yes | yes |
| 657-352 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2017-01-16 | yes | yes |
| 657-364 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | – | yes | yes |
| 657-367 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2018-11-26 | yes | yes |
| 657-368 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2018-12-06 | yes | yes |
| 657-370 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2019-02-13 | yes | yes |
| 657-376 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2019-03-21 | yes | yes |
| 657-384 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2019-05-28 | yes | yes |
| 657-400 | Onvoy ONVOY, LLC - CA | – | yes | yes |
| 657-402 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2019-05-21 | yes | yes |
| 657-407 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2019-10-30 | yes | yes |
| 657-420 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2020-02-10 | yes | yes |
| 657-425 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2020-03-13 | yes | yes |
| 657-431 | T-Mobile T-MOBILE USA, INC. | 2019-03-20 | yes | yes |
| 657-435 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2020-04-20 | yes | yes |
| 657-441 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | – | yes | yes |
| 657-443 | Vonage VONAGE AMERICA LLC | 2020-06-12 | yes | yes |
| 657-447 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2020-07-28 | yes | yes |
| 657-458 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2020-10-01 | yes | yes |
| 657-463 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2020-12-14 | yes | yes |
| 657-471 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2020-02-28 | yes | yes |
| 657-491 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2021-02-17 | yes | yes |
| 657-524 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2021-10-26 | yes | yes |
| 657-528 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2021-06-16 | yes | yes |
| 657-548 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2022-01-07 | yes | yes |
| 657-551 | T-Mobile T-MOBILE USA, INC. | 2021-11-09 | yes | yes |
| 657-552 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2021-08-05 | yes | yes |
| 657-559 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2022-01-17 | yes | yes |
| 657-593 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2022-05-27 | yes | yes |
| 657-599 | FRACTEL, LLC | 2021-03-05 | yes | yes |
| 657-621 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2022-10-12 | yes | yes |
| 657-629 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | 2022-10-27 | yes | yes |
| 657-666 | Onvoy ONVOY, LLC - CA | – | yes | yes |
| 657-670 | Onvoy ONVOY, LLC - CA | 2023-04-07 | yes | yes |
| 657-698 | T-Mobile T-MOBILE USA, INC. | 2023-09-29 | yes | yes |
| 657-746 | TON80 COMMUNICATIONS, LLC | 2022-01-11 | yes | yes |
| 657-765 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2024-09-09 | yes | yes |
| 657-770 | BARR TELL USA, LLC | 2022-06-09 | yes | yes |
| 657-779 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2024-12-20 | yes | yes |
| 657-790 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2025-01-14 | yes | yes |
| 657-807 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2025-04-02 | yes | yes |
| 657-840 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2025-11-14 | yes | yes |
| 657-849 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2026-04-17 | yes | yes |
| 657-870 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2026-05-21 | yes | yes |
| 657-876 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2026-06-04 | yes | yes |
| 657-887 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2026-09-23 | yes | no |
| 657-955 | FRACTEL, LLC | 2020-09-02 | yes | yes |
| 657-977 | FRACTEL, LLC | 2019-05-13 | 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
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 33 | 55% |
| T-MOBILE USA, INC. | T-Mobile | 7 | 11.7% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 7 | 11.7% |
| ONVOY, LLC - CA | Onvoy | 3 | 5% |
| FRACTEL, LLC | – | 3 | 5% |
| METROPCS NETWORKS, LLC | T-Mobile | 1 | 1.7% |
| TWC IP ENABLED SERVICES, LLC | Charter | 1 | 1.7% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | Peerless | 1 | 1.7% |
| VONAGE AMERICA LLC | Vonage | 1 | 1.7% |
| BANDWIDTH.COM CLEC, LLC - CA | Bandwidth | 1 | 1.7% |
| TON80 COMMUNICATIONS, LLC | – | 1 | 1.7% |
| BARR TELL USA, LLC | – | 1 | 1.7% |
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 WESTMINSTR in area code 657?
60 blocks: 200, 227, 257, 271, 277, 288, 302, 306, 318, 334, 340, 349 and 48 more, all listed in the table above.
Which carriers have numbers in WESTMINSTR?
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (33 blocks), T-MOBILE USA, INC. (7 blocks), NEW CINGULAR WIRELESS PCS, LLC (7 blocks), ONVOY, LLC - CA (3 blocks), FRACTEL, LLC (3 blocks), METROPCS NETWORKS, 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 WESTMINSTR 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.