| Business | Phone |
| Advanced Installation 24873 Santa Clara St, Hayward 94544 | (510) 264-1991 |
| C-Tech Pro 27343 Industrial Blvd # B, Hayward 94545 | (510) 264-1639 |
| Farrelle Communication Corp 28310 Industrial Blvd # E, Hayward 94545 | (510) 293-1700 |
| Independent Wireless 28302 Industrial Blvd # H, Hayward 94545 | (510) 887-5621 |