| Business | Phone |
| Carolina Phone Systems Inc 3703 Main St, Columbia 29203 | (803) 254-1195 |
| Consider It Done Telecom Inc 2320 Devine St, Columbia 29205 | (803) 779-6300 |
| Intech Systems 3033 Mcnaughton Dr # H, Columbia 29223 | (803) 736-9007 |
| Tel Com Inc 3402 Fernandina Rd, Columbia 29210 | (803) 772-3304 |