CHULAVISTA prefixes in area code 858
NANPA records 18 assigned NXX blocks to rate center CHULAVISTA in area code 858, 3.2% of the 564 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. 9 holders hold those blocks, the largest being T-MOBILE USA, INC. (5), NEW CINGULAR WIRELESS PCS, LLC (3), ONVOY, LLC - CA (3). The earliest assignment on record here is 2018-11-26 and the most recent 2026-08-07. 18 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 619 – 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 |
|---|---|---|---|---|
| 858-286 | Vonage VONAGE AMERICA LLC | 2018-11-26 | yes | yes |
| 858-294 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | 2019-07-23 | yes | yes |
| 858-315 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2021-07-01 | yes | yes |
| 858-316 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2021-07-01 | yes | yes |
| 858-318 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 2022-05-27 | yes | yes |
| 858-323 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | 2021-07-22 | yes | yes |
| 858-326 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | 2022-10-04 | yes | yes |
| 858-331 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2022-10-10 | yes | yes |
| 858-341 | T-Mobile T-MOBILE USA, INC. | 2022-10-28 | yes | yes |
| 858-389 | T-Mobile T-MOBILE USA, INC. | 2023-10-10 | yes | yes |
| 858-407 | T-Mobile T-MOBILE USA, INC. | 2024-08-30 | yes | yes |
| 858-438 | Onvoy ONVOY, LLC - CA | 2022-10-06 | yes | yes |
| 858-439 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2025-06-11 | yes | yes |
| 858-443 | T-Mobile T-MOBILE USA, INC. | 2025-10-21 | yes | yes |
| 858-463 | TON80 COMMUNICATIONS, LLC | 2022-01-11 | yes | yes |
| 858-464 | Onvoy ONVOY, LLC - CA | 2026-08-07 | yes | yes |
| 858-902 | T-Mobile T-MOBILE USA, INC. | 2024-05-31 | yes | yes |
| 858-910 | Onvoy ONVOY, LLC - CA | 2021-04-01 | 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 |
|---|---|---|---|
| T-MOBILE USA, INC. | T-Mobile | 5 | 27.8% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 3 | 16.7% |
| ONVOY, LLC - CA | Onvoy | 3 | 16.7% |
| BANDWIDTH.COM CLEC, LLC - CA | Bandwidth | 2 | 11.1% |
| VONAGE AMERICA LLC | Vonage | 1 | 5.6% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | TPx | 1 | 5.6% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 1 | 5.6% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 1 | 5.6% |
| TON80 COMMUNICATIONS, LLC | – | 1 | 5.6% |
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 CHULAVISTA in area code 858?
18 blocks: 286, 294, 315, 316, 318, 323, 326, 331, 341, 389, 407, 438 and 6 more, all listed in the table above.
Which carriers have numbers in CHULAVISTA?
T-MOBILE USA, INC. (5 blocks), NEW CINGULAR WIRELESS PCS, LLC (3 blocks), ONVOY, LLC - CA (3 blocks), BANDWIDTH.COM CLEC, LLC - CA (2 blocks), VONAGE AMERICA LLC (1 block), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is CHULAVISTA 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.