| Business | Phone |
| 21st Century Telcom Group 851 W Waveland Ave, Chicago 60613 | (773) 755-9271 |
| 21st Century Telecom 350 N Orleans St, Chicago 60654 | (312) 955-2100 |
| 21st Century Telecom Group 55 E Washington St, Chicago 60602 | (312) 372-0190 |
| A T & T 10 S Canal St, Chicago 60606 | (312) 681-5180 |
| A T & T 5 E 14th Pl, Chicago 60605 | (312) 834-0547 |
| A T & T Local Svc 10 S La Salle St, Chicago 60603 | (312) 419-3030 |
| A T & T Local Svc 600 S Federal St, Chicago 60605 | (312) 786-2074 |
| A T & T Paradyne 227 W Monroe St 14, Chicago 60606 | (312) 230-3051 |
| Access One 820 W Jackson Blvd 650, Chicago 60607 | (312) 441-1000 |
| Alcatel 980 N Michigan Ave, Chicago 60611 | (312) 214-3995 |
| Alcatel Internetworking Inc 125 S Wacker Dr, Chicago 60606 | (312) 214-2373 |
| E Tc/Nmt Inc 2019 W 95th St, Chicago 60643 | (773) 239-1283 |
| Ameritech 311 W Washington St, Chicago 60606 | (312) 263-2805 |
| A T & T 57 E Chicago Ave, Chicago 60611 | (708) 730-9571 |
| At Envios Corp 2708 N Milwaukee Ave, Chicago 60647 | (773) 342-4568 |
| At& T Cits 4635 N Malden St, Chicago 60640 | (773) 728-4526 |
| Elec-Com Technologies Group 8 S Michigan Ave, Chicago 60603 | (312) 236-7779 |
| Bell Canada 700 S Federal St 122, Chicago 60605 | (312) 957-1918 |
| Broadwing Communications 200 N La Salle St 1000, Chicago 60601 | (312) 895-8400 |
| Broadwing Communications 350 E Cermak Rd, Chicago 60616 | (312) 791-0985 |
| Express Telecom Inc 2425 W Lawrence Ave, Chicago 60625 | (773) 878-8942 |
| Equant 150 S Wacker Dr 720, Chicago 60606 | (312) 368-2600 |
| Equant Inc 601 W Polk St, Chicago 60607 | (312) 360-9422 |
| Elston Telephone Co 3447 N Pulaski Rd, Chicago 60641 | (773) 583-3555 |
| Chicago Payphones Inc 1117 W Bryn Mawr Ave, Chicago 60660 | (773) 275-4622 |
| Diversified Telecommunications 10621 S Halsted St, Chicago 60628 | (773) 568-0024 |
| Cingular Wireless 3019 N Clark St, Chicago 60657 | (773) 525-0381 |
| Cingular Wireless 7131 S Jeffery Blvd, Chicago 60649 | (773) 955-5701 |
| Decision One 3660 N Lake Shore Dr, Chicago 60613 | (773) 883-2222 |
| Comcast Cable 10 S Canal St, Chicago 60606 | (312) 906-9386 |
| Communication Phones For You 8958 S Cottage, Chicago 60619 | (773) 651-6555 |
| Data-Tel Communications 118 N Clinton St, Chicago 60661 | (312) 454-7575 |
| Telcel 3655 W Diversey Ave, Chicago 60647 | (773) 289-3648 |
| Conecta 4121 W 26th St, Chicago 60623 | (773) 762-4060 |