| Business | Phone |
| Atx Communications Inc 2100 Renaissance Blvd, King Of Prussia 19406 | (610) 755-4000 |
| Ipc Information Systems Inc 2009 Renaissance Blvd, King Of Prussia 19406 | (610) 292-0600 |
| Verizon Communications 3400 Horizon Dr, King Of Prussia 19406 | (610) 313-8700 |
| Trt Telecommunications Corp 1150 1st Ave, King Of Prussia 19406 | (610) 265-8744 |
| Tracon Telecom Corp Wayne St, King Of Prussia 19406 | (610) 768-0155 |
| Traffic Management 186 E Dekalb Pike, King Of Prussia 19406 | (610) 265-5600 |
| Olcr Telecommunications Inc 1000 1st Ave, King Of Prussia 19406 | (610) 265-8991 |