| Business | Phone |
| Alcatel 3500 Persimmon Dr, Algonquin 60102 | (847) 658-4607 |
| Communication Pros Inc 20 Twickenham Ct, Algonquin 60102 | (847) 961-5488 |
| Covad Communications 50 Berg St, Algonquin 60102 | (847) 854-6631 |
| Diamond Media Algonquin 60102 | (847) 458-6800 |