| Business | Phone |
| Adema Energy Systems Ltd 9419 Montgomery Rd, Cincinnati 45242 | (513) 791-0020 |
| Cincinnati Bell Any Distance 36 E 7th St # 2300, Cincinnati 45202 | (513) 565-4288 |
| Cincinnati Bell Inc 201 E 4th St, Cincinnati 45202 | (513) 397-9900 |
| Cincinnati Bell Telephone Co 9597 Colerain Ave # 2, Cincinnati 45251 | (513) 741-5600 |
| Csc Wireless 787 Ohio Pike, Cincinnati 45245 | (513) 752-5400 |
| Jacobs Telephone Contractors 1155 Western Ave, Cincinnati 45203 | (513) 721-9770 |
| Mci 134 Merchant St, Cincinnati 45246 | (513) 771-3640 |
| Mci 144 Merchant St, Cincinnati 45246 | (513) 719-5200 |
| Mci 8172 Montgomery Rd, Cincinnati 45236 | (513) 791-6730 |
| Metro One Telecommunications 1329 E Kemper Rd, Cincinnati 45246 | (513) 671-7770 |
| Nu Vox Communications Inc 344 Gest St # B, Cincinnati 45203 | (513) 842-7000 |
| Taqua Systems Inc 5861 Cheviot Rd, Cincinnati 45247 | (513) 741-1200 |
| Telephone Pioneers Of America 201 E 4th St, Cincinnati 45202 | (513) 397-1515 |