| Business | Phone |
| Airwaves Wireless Inc 33 E Patrick St, Frederick 21701 | (301) 620-9787 |
| Business Radio Products 1046 W Patrick St # D, Frederick 21703 | (301) 682-5333 |
| Cellular One 1170 W Patrick St # C, Frederick 21703 | (301) 846-0555 |
| Cellular One 5235 Westview Dr, Frederick 21703 | (301) 682-8957 |
| Cellular One 5500 Buckeystown Pike, Frederick 21703 | (301) 846-0565 |
| Cingular Wireless 1301 W Patrick St, Frederick 21702 | (301) 620-1178 |
| Compass Wireless 1202 E Patrick St, Frederick 21701 | (301) 620-9850 |
| East Coast Communications 5251 Buckeystown Pike, Frederick 21704 | (301) 663-5587 |
| Intouch 5500 Buckeystown Pike, Frederick 21703 | (301) 620-9660 |
| Kiosks Corp 5604 Buckeystown Pike, Frederick 21704 | (301) 668-5711 |
| P C Cell 410 N Market St, Frederick 21701 | (301) 620-2944 |
| Protol Mid American 1407 W Patrick St, Frederick 21702 | (301) 695-7243 |
| Source 4 Wireless Llc 5500 Buckeystown Pike, Frederick 21703 | (301) 620-1977 |
| Verizon Wireless 1160 W Patrick St, Frederick 21703 | (301) 695-6000 |
| Verizon Wireless Auth Agent 1700 Kingfisher Dr # 24, Frederick 21701 | (301) 846-9663 |