| Business | Phone |
| Aversa Communications 3000 Chestnut Ave # 331, Baltimore 21211 | (410) 338-0318 |
| Distributed Computing Inc 3846 Falls Rd # A, Baltimore 21211 | (410) 243-9334 |
| Proactive Telenet Inc 4127 Slater Ave, Baltimore 21236 | (410) 529-6024 |
| Global Interactive Technology 326 N Charles St, Baltimore 21201 | (410) 752-7744 |
| Harlan Pay Telephones Baltimore 21201 | (410) 453-0292 |
| Mci Telecommunications 1801 E Fayette St, Baltimore 21231 | (410) 558-1241 |
| Nwl Cellular 6790 Reisterstown Rd, Baltimore 21215 | (410) 318-6400 |
| Aversa Communications 409 Washington Ave, Baltimore 21204 | (410) 296-0346 |
| Phone Store 5447 Park Heights Ave, Baltimore 21215 | (410) 542-3900 |
| Single Source Inc 25 S Charles St, Baltimore 21201 | (410) 649-0049 |
| Talk America 320 Saint Paul St, Baltimore 21202 | (410) 685-0100 |
| Universal Technologies 2129 Saint Paul St, Baltimore 21218 | (410) 837-5800 |
| Global Link Communications 300 Reisterstown Rd, Baltimore 21208 | (410) 358-1818 |
| Interconnect Services 1212 Philco Rd, Baltimore 21237 | (410) 687-8900 |
| Tci Media Svc Baltimore 21237 | (410) 649-1700 |