| Business | Phone |
| Alternative Communications 3537 E 117th Dr, Denver 80233 | (303) 457-2589 |
| Cheap Talk 2681 W 64th Ave, Denver 80221 | (303) 457-1881 |
| Phone Exchange 5555 Pecos St # B, Denver 80221 | (303) 433-3604 |
| Mitech Solutions Inc 6401 Broadway, Denver 80221 | (303) 427-0151 |
| Creative Aspect Electronics 4385 Xavier St, Denver 80212 | (303) 433-7007 |
| Dfc Telecom 8200 E Pacific Pl # 102, Denver 80231 | (303) 696-9217 |
| Alpine Communications 12550 W Colfax Ave # 111, Denver 80215 | (303) 428-1212 |
| Applied Telephone Technology 1170 S Sheridan Blvd # C, Denver 80232 | (303) 935-0099 |