Phone numbers in Nationalcy, California
Nationalcy has 47 phone prefixes in area codes 619, 858.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), MetroPCS (T-Mobile). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 36%
- Local phone company 19%
- Internet / business phone carrier 45%
Every prefix in Nationalcy
Search the first six digits of a number in this list. If it's here, the number started in Nationalcy with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 619-245 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 619-250 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 619-259 | T-Mobile (including Sprint) | Mobile carrier | 2007 |
| 619-267 | AT&T (local phone) | Local phone company | – |
| 619-273 | Bandwidth | Internet / business phone carrier | – |
| 619-274 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 619-292 | AT&T (local phone) | Local phone company | – |
| 619-327 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 619-336 | AT&T (local phone) | Local phone company | – |
| 619-352 | T-Mobile (including Sprint) | Mobile carrier | – |
| 619-399 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 619-419 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 619-434 | Comcast | Internet / business phone carrier | – |
| 619-470 | AT&T (local phone) | Local phone company | – |
| 619-472 | AT&T (local phone) | Local phone company | – |
| 619-474 | AT&T (local phone) | Local phone company | – |
| 619-475 | AT&T (local phone) | Local phone company | – |
| 619-477 | AT&T (local phone) | Local phone company | – |
| 619-479 | AT&T (local phone) | Local phone company | – |
| 619-480 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 619-505 | Onvoy | Internet / business phone carrier | 2016 |
| 619-512 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 619-552 | MetroPCS (T-Mobile) | Mobile carrier | 2014 |
| 619-586 | MetroPCS (T-Mobile) | Mobile carrier | 2014 |
| 619-603 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 619-649 | MCImetro (Verizon Business) | Internet / business phone carrier | 2001 |
| 619-731 | AT&T Mobility | Mobile carrier | 2015 |
| 619-732 | Onvoy | Internet / business phone carrier | – |
| 619-765 | Onvoy | Internet / business phone carrier | – |
| 619-773 | Tpx Communications | Internet / business phone carrier | – |
| 619-789 | Onvoy | Internet / business phone carrier | – |
| 619-791 | Teleport Communications America | Internet / business phone carrier | – |
| 619-802 | MCImetro (Verizon Business) | Internet / business phone carrier | 2010 |
| 619-829 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 619-856 | T-Mobile (including Sprint) | Mobile carrier | – |
| 619-900 | Bandwidth | Internet / business phone carrier | – |
| 619-910 | Onvoy | Internet / business phone carrier | 2024 |
| 619-918 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 619-919 | AT&T Mobility | Mobile carrier | 2014 |
| 619-931 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 619-962 | AT&T Mobility | Mobile carrier | – |
| 619-967 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 858-417 | AT&T Mobility | Mobile carrier | 2024 |
| 858-462 | TON80 Communications | Internet / business phone carrier | 2022 |
| 858-599 | Fractel | Internet / business phone carrier | 2020 |
| 858-786 | Fractel | Internet / business phone carrier | 2021 |
| 858-808 | Fractel | Internet / business phone carrier | 2022 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.