| Business | Phone |
| Acs Dataline 22320 Foothill Blvd # 410, Hayward 94541 | (510) 582-2145 |
| Broadwing Communications 23965 Connecticut St, Hayward 94545 | (510) 887-8920 |
| Central System Communication 2196 American Ave, Hayward 94545 | (510) 786-1681 |
| Executive Phone Svc 32727 Mission Blvd, Hayward 94544 | (510) 471-9000 |
| Hood Communications 21024 Alexander Ct, Hayward 94545 | (510) 670-9900 |
| Lucent Technologies 1288 San Luis Obispo St, Hayward 94544 | (510) 475-5000 |
| Masters Of Communications 1636 Sunny Pl, Hayward 94545 | (510) 887-4800 |
| Meridian Hayward 94545 | (510) 785-2480 |
| Nth Connect Telecom Inc 3447 Investment Blvd, Hayward 94545 | (510) 887-9887 |
| Ready-Com 1205 Walpert St, Hayward 94541 | (510) 582-5555 |
| Reliance Telecommunications 21087 Cabot Blvd # 7, Hayward 94545 | (510) 786-2200 |
| Shared Technologies 20949 Cabot Blvd, Hayward 94545 | (510) 856-4300 |
| Teledynamic Com Inc 3501 Breakwater Ave, Hayward 94545 | (510) 785-2480 |
| Westone Corporation Hayward 94545 | (510) 887-7111 |
| Solcom Inc 22336 Meekland Ave, Hayward 94541 | (510) 940-2490 |
| Totlcom Inc Hayward 94541 | (510) 733-5000 |