| Business | Phone |
| Adelcon Baltimore 21206 | (410) 325-7570 |
| All City Comp-Tel Svc 28 Penny Ln, Baltimore 21209 | (410) 484-0368 |
| Eastel Corp Baltimore 21224 | (410) 327-8376 |
| Phone Shack 1310 Washington Irving Ln, Baltimore 21220 | (410) 780-4229 |
| Kentel Telecommunications 1920 Hillenwood Rd, Baltimore 21239 | (443) 919-4966 |
| American Communication Equip 2647 Liberty Pkwy, Baltimore 21222 | (410) 282-4600 |
| Astec Aps 3751 Proctor Ln, Baltimore 21236 | (410) 256-4257 |
| Telecommunications Concepts 110 E Lombard St, Baltimore 21202 | (410) 435-1111 |
| Tri Link 7208 1/2 Harford Rd, Baltimore 21234 | (410) 319-4800 |