| Business | Phone |
| Wireless World 405 N Frederick Ave # A, Gaithersburg 20877 | (240) 631-2355 |
| Radio Shack 872 Muddy Branch Rd, Gaithersburg 20878 | (301) 987-9534 |
| Digitron-Digital Electronics 7895 Cessna Ave # F, Gaithersburg 20879 | (301) 670-6710 |
| Global Cellular 701 Russell Ave, Gaithersburg 20877 | (301) 987-0016 |