JOLIET prefixes in area code 779
NANPA records 26 assigned NXX blocks to rate center JOLIET in area code 779, 7.3% of the 354 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. 8 holders hold those blocks, the largest being NEW CINGULAR WIRELESS PCS, LLC - IL (11), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (5), T-MOBILE USA, INC. (5). The earliest assignment on record here is 2006-11-13 and the most recent 2026-09-18. 26 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 406, 815 – 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 |
|---|---|---|---|---|
| 779-205 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2012-05-30 | yes | yes |
| 779-206 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 2012-06-20 | yes | yes |
| 779-225 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 2011-09-21 | yes | yes |
| 779-227 | T-Mobile METROPCS, INC. | 2014-07-01 | yes | yes |
| 779-230 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2016-09-28 | yes | yes |
| 779-231 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 2015-12-21 | yes | yes |
| 779-233 | T-Mobile T-MOBILE USA, INC. | 2011-07-21 | yes | yes |
| 779-242 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2017-10-05 | yes | yes |
| 779-260 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2018-10-08 | yes | yes |
| 779-267 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2020-01-17 | yes | yes |
| 779-279 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2008-10-29 | yes | yes |
| 779-341 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2021-12-29 | yes | yes |
| 779-374 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 2023-07-26 | yes | yes |
| 779-375 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2023-07-26 | yes | yes |
| 779-379 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2008-10-29 | yes | yes |
| 779-408 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 2025-01-21 | yes | yes |
| 779-434 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2025-11-14 | yes | yes |
| 779-435 | AT&T ILLINOIS BELL TEL CO | 2006-11-13 | yes | yes |
| 779-449 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 2026-09-18 | yes | no |
| 779-456 | T-Mobile T-MOBILE USA, INC. | 2008-01-09 | yes | yes |
| 779-702 | T-Mobile T-MOBILE USA, INC. | 2014-06-11 | yes | yes |
| 779-703 | T-Mobile T-MOBILE USA, INC. | 2013-10-07 | yes | yes |
| 779-707 | Bandwidth BANDWIDTH.COM CLEC, LLC - IL | 2015-04-21 | yes | yes |
| 779-758 | FRACTEL, LLC | 2019-10-11 | yes | yes |
| 779-875 | T-Mobile T-MOBILE USA, INC. | 2007-07-12 | yes | yes |
| 779-939 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2016-02-03 | 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 |
|---|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | AT&T | 11 | 42.3% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | Verizon | 5 | 19.2% |
| T-MOBILE USA, INC. | T-Mobile | 5 | 19.2% |
| METROPCS, INC. | T-Mobile | 1 | 3.8% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | Verizon | 1 | 3.8% |
| ILLINOIS BELL TEL CO | AT&T | 1 | 3.8% |
| BANDWIDTH.COM CLEC, LLC - IL | Bandwidth | 1 | 3.8% |
| FRACTEL, LLC | – | 1 | 3.8% |
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 JOLIET in area code 779?
26 blocks: 205, 206, 225, 227, 230, 231, 233, 242, 260, 267, 279, 341 and 14 more, all listed in the table above.
Which carriers have numbers in JOLIET?
NEW CINGULAR WIRELESS PCS, LLC - IL (11 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (5 blocks), T-MOBILE USA, INC. (5 blocks), METROPCS, INC. (1 block), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL (1 block), ILLINOIS BELL TEL CO (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is JOLIET 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.