FONTANA prefixes in area code 840
NANPA records 12 assigned NXX blocks to rate center FONTANA in area code 840, 9.2% of the 130 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 T-MOBILE USA, INC. (4), NEW CINGULAR WIRELESS PCS, LLC (3), ONVOY, LLC - CA (2). The earliest assignment on record here is 2020-12-24 and the most recent 2025-09-19. 12 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 909, 913 – 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 |
|---|---|---|---|---|
| 840-201 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2021-03-11 | yes | yes |
| 840-210 | T-Mobile T-MOBILE USA, INC. | 2021-12-14 | yes | yes |
| 840-217 | T-Mobile T-MOBILE USA, INC. | 2022-09-02 | yes | yes |
| 840-232 | T-Mobile T-MOBILE USA, INC. | 2023-06-09 | yes | yes |
| 840-239 | Onvoy ONVOY, LLC - CA | 2023-10-02 | yes | yes |
| 840-248 | T-Mobile T-MOBILE USA, INC. | 2023-12-05 | yes | yes |
| 840-261 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2024-05-29 | yes | yes |
| 840-263 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2024-09-09 | yes | yes |
| 840-271 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2025-01-14 | yes | yes |
| 840-285 | Onvoy ONVOY, LLC - CA | 2025-09-19 | yes | yes |
| 840-666 | FRACTEL, LLC | 2020-12-24 | yes | yes |
| 840-788 | FRACTEL, LLC | 2021-07-16 | 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 | 4 | 33.3% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 3 | 25% |
| ONVOY, LLC - CA | Onvoy | 2 | 16.7% |
| FRACTEL, LLC | – | 2 | 16.7% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 1 | 8.3% |
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 FONTANA in area code 840?
12 blocks: 201, 210, 217, 232, 239, 248, 261, 263, 271, 285, 666, 788. The table above gives the holder of each.
Which carriers have numbers in FONTANA?
T-MOBILE USA, INC. (4 blocks), NEW CINGULAR WIRELESS PCS, LLC (3 blocks), ONVOY, LLC - CA (2 blocks), FRACTEL, LLC (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is FONTANA 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.