| Business | Phone |
| A T & T 44 E Mifflin St 700, Madison 53703 | (608) 259-2229 |
| Audio Connections 409 N Fair Oaks Ave, Madison 53714 | (608) 244-3036 |
| Badger Telecommunications 5902 Raymond Rd, Madison 53711 | (608) 268-0919 |
| One Communications 5305 Buttonwood Dr, Madison 53718 | (608) 268-7200 |
| Richard Cox 245 S Park St, Madison 53715 | (608) 255-0375 |
| Value Comm Corp Madison 53704 | (608) 244-1254 |
| Verizon 8017 Excelsior Dr 110, Madison 53717 | (608) 831-0700 |
| Tds Telecommunications Corp 525 Junction Rd, Madison 53717 | (608) 664-4000 |
| Telaid 108 S Webster St 300, Madison 53703 | (608) 441-1524 |
| Touch-Tel Wireless 89 E Towne Mall, Madison 53704 | (608) 240-0980 |
| Sprint 4261 Lien Rd, Madison 53704 | (608) 240-2700 |
| T Ds Telecom 525 Junction Rd, Madison 53717 | (608) 827-9522 |
| Sita 316 W Washington Ave, Madison 53703 | (608) 260-8702 |
| Prince Telecom 2011 S Stoughton Rd, Madison 53716 | (608) 223-9003 |
| Kmc Telecom 710 E Mifflin St, Madison 53703 | (608) 250-4045 |
| N Ps Telecom 525 Junction Rd, Madison 53717 | (608) 664-4793 |
| Neumann Communications 22 Windswept Way, Madison 53719 | (608) 274-8888 |