| Business | Phone |
| Alta Telecom Inc 26257 Research Pl, Hayward 94545 | (510) 782-2280 |
| Cherring Telecom 3210 Diablo Ave, Hayward 94545 | (510) 782-8889 |
| Mas Tec 26252 Eden Landing Rd, Hayward 94545 | (510) 670-0861 |
| Mike's Residential Phone Svc Hayward 94545 | (510) 785-1611 |
| Top Line Installations 2471 American Ave, Hayward 94545 | (510) 783-3487 |
| Tri Star Communications Hayward 94541 | (510) 278-6667 |