| Business | Phone |
| Aea Plus Telecoms San Mateo 94403 | (650) 522-8198 |
| Packet Fusion Inc 1900 S Norfolk St # 110, San Mateo 94403 | (650) 292-6000 |
| Rcn Corp 1400 Fashion Island Blvd, San Mateo 94404 | (650) 212-8000 |
| T-Systems Nova 400 S El Camino Real, San Mateo 94402 | (650) 401-5200 |
| Teleports International San Mateo 94401 | (650) 342-4673 |
| Tgec Communications 191 W 25th Ave, San Mateo 94403 | (650) 645-5678 |
| X O Communications Inc 3 Waters Park Dr, San Mateo 94403 | (650) 227-5000 |