| Business | Phone |
| Mtc Systems 3626 University Ave, Waterloo 50701 | (319) 233-3601 |
| New Century Communications 2101 Falls Ave, Waterloo 50701 | (319) 232-1999 |
| Schmitt Telecom Partners Inc 170 W Mullan Ave, Waterloo 50701 | (319) 232-3701 |
| Communications Systems Of Iowa 2072 Howard Ave, Waterloo 50702 | (319) 291-9045 |