Phone numbers in Rnchobrndo, California
Rnchobrndo has 41 phone prefixes in area code 858.
Biggest holders: AT&T (local phone), MCImetro (Verizon Business), Tpx Communications. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 12%
- Local phone company 39%
- Internet / business phone carrier 46%
- Phone company 2%
Every prefix in Rnchobrndo
Search the first six digits of a number in this list. If it's here, the number started in Rnchobrndo with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 858-207 | Teleport Communications America | Internet / business phone carrier | – |
| 858-217 | Tpx Communications | Internet / business phone carrier | – |
| 858-234 | North County Communication | Phone company | – |
| 858-304 | AT&T (local phone) | Local phone company | – |
| 858-312 | Comcast | Internet / business phone carrier | – |
| 858-376 | Tpx Communications | Internet / business phone carrier | – |
| 858-385 | AT&T (local phone) | Local phone company | – |
| 858-421 | AT&T Mobility | Mobile carrier | 2025 |
| 858-432 | Tpx Communications | Internet / business phone carrier | – |
| 858-451 | AT&T (local phone) | Local phone company | – |
| 858-472 | Verizon Wireless | Mobile carrier | 2001 |
| 858-485 | AT&T (local phone) | Local phone company | – |
| 858-487 | AT&T (local phone) | Local phone company | – |
| 858-521 | AT&T (local phone) | Local phone company | – |
| 858-524 | AT&T (local phone) | Local phone company | – |
| 858-544 | Fractel | Internet / business phone carrier | 2021 |
| 858-588 | Fractel | Internet / business phone carrier | 2021 |
| 858-592 | AT&T (local phone) | Local phone company | – |
| 858-605 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 858-613 | AT&T (local phone) | Local phone company | – |
| 858-618 | AT&T (local phone) | Local phone company | – |
| 858-649 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 858-655 | AT&T (local phone) | Local phone company | – |
| 858-673 | AT&T (local phone) | Local phone company | – |
| 858-674 | AT&T (local phone) | Local phone company | – |
| 858-675 | AT&T (local phone) | Local phone company | – |
| 858-676 | AT&T (local phone) | Local phone company | – |
| 858-683 | Matrix Telecom, Llc. S/i/i Tnci | Internet / business phone carrier | – |
| 858-705 | AT&T Mobility | Mobile carrier | – |
| 858-716 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 858-753 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 858-774 | AT&T Mobility | Mobile carrier | – |
| 858-776 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 858-798 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 858-815 | Matrix Telecom, Llc. S/i/i Tnci | Internet / business phone carrier | – |
| 858-879 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 858-924 | AT&T (local phone) | Local phone company | – |
| 858-927 | Onvoy | Internet / business phone carrier | – |
| 858-942 | Teleport Communications America | Internet / business phone carrier | – |
| 858-943 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 858-946 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
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.