| ZIP Code | Verizon | ATT | T-Mobile | 
|---|---|---|---|
| 21771 | 99% | 100% | 100% | 
| Licensee | Address | Height | Tower Type | 
|---|---|---|---|
| New Cingular Wireless PCS, LLC | 9520 Fire Tower Rd, Ijamsville, MD 21754 | 45.7 | POLE | 
| Cellco Partnership | 2123 Dixon Rd, Frederick, MD 21704 | 135.6 | TOWER | 
| NEW CINGULAR WIRELESS PCS, LLC | 22409 MD-97, Brookeville, MD 20833 | 44.2 | UPOLE | 
| NEW CINGULAR WIRELESS PCS, LLC | 15155 Triadelphia Mill Rd, Glenelg, MD 21737 | 146 | MAST | 
| NEW CINGULAR WIRELESS PCS, LLC | 14030 Highland Rd, Highland, MD 20777 | 72.2 | MAST | 
| Carrier | Address | Comment | Date Added | 
|---|---|---|---|
| Verizon | 3313 Roscommon Dr | Frequent dropped calls and very poor signal with Verizon | 2014 | 
| AT&T | 11434 Keymar Rd | Internet wireless | 2019 | 
| Verizon | 11456 Keymar Rd | Spotty coverage, lots of dropped calls. Emails & text messages are more reliable, but even they may take some time to go through. | 2015 | 
| Sprint | 2322 Todd Ln | No LTE, No 3G, dropped calls | 2019 | 
| AT&T | 7969 Parkland Pl | poor to no signal on AT&T | 2015 | 
| Carrier | Address | Phone | Directions | 
|---|---|---|---|
| AT&T | 1311 South Main St Ste 116, Mount Airy, MD, 21771 | 301-703-8331 | Directions | 
| Verizon | 305 E Ridgeville Blvd, Mount Airy, MD, 21771 | 301-829-3380 | Directions | 
| T-Mobile | 9811 Main St Suite 106, Damascus, MD, 20872 | 301-368-3239 | Directions |