T-Mobile currently ranks first for coverage in this area, with a coverage score of 57.7. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.Coverage rankings for Virginia
| Rank | Carrier | Score | Overall | 4G LTE | 5G | Fast 5G | Average Signal |
|---|---|---|---|---|---|---|---|
| 1 | T-Mobile | 57.7 | 56.7% | 56.6% | 49.1% | 33.7% | -92 dBm |
| 2 | Verizon | 56.7 | 86.7% | 86.7% | 16.1% | 10.3% | -97 dBm |
| 3 | AT&T | 50.7 | 69.9% | 69.6% | 30.8% | 20.9% | -113 dBm |
Scores include coverage area, network type, and average signal strength.
Cell phone coverage map for Virginia
Zoom in for local detail. Tap or click a colored area to see coverage and signal details. On mobile, use two fingers to move the map.
Map data © OpenStreetMap contributors, © CARTO. Rendered with MapLibre. FCC BDC mobile coverage processed by Compare Wireless Carriers.
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Cell phone coverage by network in Virginia
T-Mobile
- Overall
- 56.7%
- 4G LTE
- 56.6%
- 5G
- 49.1%
- Fast 5G
- 33.7%
Verizon
- Overall
- 86.7%
- 4G LTE
- 86.7%
- 5G
- 16.1%
- Fast 5G
- 10.3%
AT&T
- Overall
- 69.9%
- 4G LTE
- 69.6%
- 5G
- 30.8%
- Fast 5G
- 20.9%
Coverage varies by neighborhood. Your carrier shouldn’t.
US Mobile lets you switch between all three major networks, so you can choose the one that works best where you actually use your phone.
Pricing, network access, switching terms, and home internet availability may vary.
Coverage by county in Virginia
Counties are shown for statewide comparison. Coverage percentages use land-area only coverage.
| County | Verizon | AT&T | T-Mobile |
|---|---|---|---|
| Accomack County, VA | 98.8% 98.8% 11.9% 7.3% -90 dBm | 80.8% 80.3% 55.0% 43.7% -116 dBm | 59.6% 59.5% 48.3% 25.5% -97 dBm |
| Albemarle County, VA | 96.6% 96.6% 8.3% 5.1% -98 dBm | 68.4% 68.3% 12.3% 5.5% -111 dBm | 64.2% 64.2% 51.2% 31.3% -95 dBm |
| Alexandria County, VA | 100.0% 100.0% 98.1% 91.0% -85 dBm | 100.0% 100.0% 99.7% 85.9% -94 dBm | 100.0% 100.0% 100.0% 100.0% -71 dBm |
| Alleghany County, VA | 71.3% 71.2% 7.4% 3.9% -100 dBm | 57.5% 57.3% 23.5% 10.6% -114 dBm | 46.2% 45.6% 40.2% 26.9% -92 dBm |
| Amelia County, VA | 93.8% 93.8% 4.4% 2.1% -101 dBm | 63.4% 63.2% 35.8% 18.5% -117 dBm | 33.6% 33.6% 26.1% 14.7% -96 dBm |
| Amherst County, VA | 94.2% 94.2% 8.2% 4.3% -99 dBm | 34.6% 34.5% 4.9% 2.8% -112 dBm | 34.7% 34.6% 27.1% 15.0% -96 dBm |
| Appomattox County, VA | 92.0% 92.0% 5.1% 2.7% -100 dBm | 56.6% 56.6% 11.5% 8.9% -116 dBm | 42.8% 42.7% 33.3% 19.2% -96 dBm |
| Arlington County, VA | 100.0% 100.0% 94.4% 81.6% -87 dBm | 99.7% 99.5% 99.5% 77.2% -95 dBm | 100.0% 100.0% 100.0% 100.0% -73 dBm |
| Augusta County, VA | 78.9% 78.9% 17.8% 12.1% -96 dBm | 62.2% 62.2% 22.1% 12.1% -112 dBm | 63.8% 63.6% 57.9% 43.8% -90 dBm |
| Bath County, VA | 35.9% 35.9% 0.0% 0.0% -104 dBm | 33.3% 33.3% 5.6% 0.2% -117 dBm | 18.6% 18.5% 12.6% 6.2% -98 dBm |
| Bedford city, VA County | 96.4% 96.4% 8.7% 5.6% -96 dBm | 76.1% 76.1% 17.8% 9.7% -114 dBm | 58.3% 58.3% 52.6% 32.3% -94 dBm |
| Bland County, VA | 85.9% 85.9% 1.8% 0.7% -97 dBm | 62.2% 62.0% 31.1% 25.7% -115 dBm | 35.0% 34.8% 29.9% 20.3% -93 dBm |
| Botetourt County, VA | 85.7% 85.7% 5.9% 3.8% -95 dBm | 76.7% 76.6% 12.5% 8.0% -111 dBm | 66.7% 66.3% 60.2% 42.5% -92 dBm |
| Bristol County, VA | 100.0% 100.0% 78.8% 62.8% -87 dBm | 98.8% 98.8% 86.6% 64.2% -109 dBm | 98.8% 97.7% 98.5% 90.4% -83 dBm |
| Brunswick County, VA | 95.5% 95.5% 10.0% 5.5% -99 dBm | 67.7% 67.6% 25.8% 17.1% -116 dBm | 51.8% 51.8% 40.1% 22.6% -97 dBm |
| Buchanan County, VA | 34.3% 34.3% 2.0% 1.0% -101 dBm | 24.9% 24.8% 3.7% 3.4% -115 dBm | 4.3% 4.3% 3.3% 1.5% -96 dBm |
| Buckingham County, VA | 93.3% 93.3% 8.9% 4.9% -99 dBm | 31.0% 31.0% 3.7% 3.2% -116 dBm | 58.8% 58.7% 49.1% 30.2% -95 dBm |
| Buena Vista County, VA | 98.8% 98.8% 0.0% 0.0% -83 dBm | 99.4% 99.4% 88.1% 22.0% -108 dBm | 99.4% 99.4% 95.8% 84.5% -87 dBm |
| Campbell County, VA | 93.4% 93.4% 12.6% 7.7% -97 dBm | 77.8% 77.8% 14.4% 9.9% -112 dBm | 63.7% 63.7% 52.8% 34.4% -94 dBm |
| Caroline County, VA | 96.1% 96.1% 18.9% 10.8% -97 dBm | 82.7% 81.0% 57.9% 39.3% -114 dBm | 60.8% 60.8% 45.3% 27.1% -96 dBm |
| Carroll County, VA | 92.3% 92.3% 13.0% 7.8% -99 dBm | 70.9% 70.9% 6.8% 3.6% -113 dBm | 66.0% 65.8% 59.9% 38.0% -93 dBm |
| Charles City County, VA | 99.8% 99.8% 8.2% 4.4% -98 dBm | 82.2% 82.2% 8.2% 7.0% -114 dBm | 62.0% 62.0% 47.6% 27.2% -97 dBm |
| Charlotte County, VA | 77.7% 77.7% 5.7% 3.1% -101 dBm | 49.9% 49.9% 7.0% 6.2% -117 dBm | 41.3% 41.3% 30.2% 17.2% -97 dBm |
| Charlottesville County, VA | 100.0% 100.0% 90.5% 73.4% -87 dBm | 100.0% 100.0% 95.1% 42.6% -104 dBm | 100.0% 100.0% 99.2% 97.0% -81 dBm |
| Chesapeake County, VA | 86.4% 86.4% 48.9% 35.3% -94 dBm | 86.1% 86.1% 51.7% 31.7% -111 dBm | 79.0% 78.9% 75.0% 63.1% -86 dBm |
| Chesterfield County, VA | 99.2% 99.2% 50.8% 34.1% -95 dBm | 95.4% 95.4% 54.3% 38.8% -111 dBm | 91.4% 91.3% 86.0% 68.6% -89 dBm |
| Clarke County, VA | 95.5% 95.5% 30.0% 15.6% -97 dBm | 98.2% 96.1% 92.1% 55.6% -110 dBm | 96.3% 96.2% 91.7% 72.0% -90 dBm |
| Colonial Heights County, VA | 100.0% 100.0% 87.8% 73.0% -88 dBm | 100.0% 100.0% 94.4% 59.2% -109 dBm | 100.0% 100.0% 100.0% 96.9% -82 dBm |
| Covington County, VA | 100.0% 100.0% 57.6% 48.9% -86 dBm | 100.0% 100.0% 71.9% 51.8% -110 dBm | 99.3% 99.3% 98.6% 97.8% -80 dBm |
| Craig County, VA | 14.0% 14.0% 0.1% 0.0% -105 dBm | 14.6% 14.6% 0.3% 0.1% -115 dBm | 3.7% 3.7% 2.7% 1.6% -94 dBm |
| Culpeper County, VA | 89.7% 89.7% 14.1% 8.9% -98 dBm | 87.0% 84.6% 66.2% 47.7% -113 dBm | 71.9% 71.8% 62.6% 40.5% -93 dBm |
| Cumberland County, VA | 93.5% 93.5% 10.5% 6.2% -101 dBm | 53.8% 53.8% 6.7% 5.4% -116 dBm | 57.6% 57.6% 45.5% 25.0% -96 dBm |
| Danville County, VA | 99.9% 99.9% 55.5% 34.0% -92 dBm | 100.0% 100.0% 98.4% 69.0% -104 dBm | 99.4% 99.3% 95.1% 83.2% -86 dBm |
| Dickenson County, VA | 49.1% 49.1% 0.0% 0.0% -101 dBm | 35.9% 35.9% 9.7% 8.6% -118 dBm | 8.1% 8.1% 5.5% 2.9% -97 dBm |
| Dinwiddie County, VA | 98.9% 98.9% 5.1% 2.8% -96 dBm | 72.0% 72.0% 6.0% 4.4% -113 dBm | 48.1% 48.1% 37.6% 20.8% -96 dBm |
| Emporia County, VA | 100.0% 100.0% 44.1% 29.9% -85 dBm | 100.0% 100.0% 94.4% 71.8% -106 dBm | 100.0% 100.0% 100.0% 74.6% -89 dBm |
| Essex County, VA | 98.8% 98.8% 23.7% 15.1% -96 dBm | 83.7% 83.7% 62.2% 45.5% -114 dBm | 73.2% 73.2% 53.2% 29.8% -96 dBm |
| Fairfax City County, VA | 100.0% 100.0% 85.4% 65.0% -88 dBm | 100.0% 100.0% 100.0% 68.8% -99 dBm | 100.0% 100.0% 100.0% 100.0% -80 dBm |
| Fairfax County, VA | 99.2% 99.2% 57.7% 40.3% -92 dBm | 99.3% 99.0% 92.0% 63.9% -106 dBm | 96.3% 96.3% 92.3% 81.5% -84 dBm |
| Falls Church County, VA | 100.0% 100.0% 96.0% 82.0% -88 dBm | 100.0% 100.0% 100.0% 88.0% -98 dBm | 100.0% 100.0% 100.0% 100.0% -71 dBm |
| Fauquier County, VA | 93.2% 93.2% 15.2% 9.2% -97 dBm | 87.3% 84.0% 64.1% 42.5% -114 dBm | 71.0% 70.7% 64.2% 42.5% -93 dBm |
| Floyd County, VA | 94.5% 94.5% 5.0% 2.5% -99 dBm | 83.1% 83.1% 1.9% 1.2% -111 dBm | 51.1% 51.1% 44.3% 26.1% -95 dBm |
| Fluvanna County, VA | 93.1% 93.1% 3.9% 1.9% -102 dBm | 51.8% 51.8% 8.7% 1.9% -115 dBm | 59.0% 59.0% 46.5% 25.3% -97 dBm |
| Franklin City County, VA | 100.0% 100.0% 88.6% 70.9% -88 dBm | 100.0% 100.0% 70.9% 50.9% -112 dBm | 100.0% 100.0% 93.6% 66.8% -90 dBm |
| Franklin County, VA | 92.0% 92.0% 7.7% 4.3% -98 dBm | 80.3% 80.3% 14.0% 5.3% -113 dBm | 66.5% 66.5% 58.9% 37.9% -94 dBm |
| Frederick County, VA | 94.6% 94.6% 28.1% 18.0% -95 dBm | 94.9% 94.8% 81.9% 56.7% -111 dBm | 89.9% 89.8% 85.4% 67.3% -89 dBm |
| Fredericksburg County, VA | 100.0% 100.0% 93.3% 83.6% -79 dBm | 100.0% 100.0% 98.1% 82.8% -99 dBm | 97.8% 97.8% 97.8% 95.9% -79 dBm |
| Galax County, VA | 100.0% 100.0% 6.5% 3.7% -90 dBm | 39.2% 37.3% 24.4% 22.1% -117 dBm | 100.0% 100.0% 100.0% 99.1% -82 dBm |
| Giles County, VA | 80.9% 80.9% 2.2% 1.2% -101 dBm | 58.0% 57.9% 21.3% 10.6% -113 dBm | 43.6% 43.6% 40.2% 26.5% -91 dBm |
| Gloucester County, VA | 99.9% 99.9% 37.3% 21.1% -96 dBm | 93.5% 93.5% 39.6% 28.5% -115 dBm | 62.2% 62.1% 51.3% 31.7% -95 dBm |
| Goochland County, VA | 99.4% 99.4% 19.7% 12.6% -97 dBm | 83.3% 83.3% 17.3% 12.7% -113 dBm | 57.9% 57.9% 50.2% 32.0% -94 dBm |
| Grayson County, VA | 44.9% 44.9% 0.0% 0.0% -99 dBm | 30.2% 30.1% 6.7% 5.0% -117 dBm | 25.6% 25.6% 24.2% 15.6% -92 dBm |
| Greene County, VA | 88.6% 88.6% 5.5% 3.2% -96 dBm | 76.8% 76.8% 9.6% 8.5% -112 dBm | 64.8% 64.7% 55.0% 34.5% -94 dBm |
| Greensville County, VA | 85.8% 85.8% 6.4% 3.4% -100 dBm | 56.7% 56.7% 5.1% 4.1% -115 dBm | 44.0% 44.0% 34.9% 20.1% -96 dBm |
| Halifax County, VA | 90.5% 90.5% 9.5% 5.5% -98 dBm | 76.0% 76.0% 13.0% 9.7% -115 dBm | 49.5% 49.5% 42.6% 25.8% -94 dBm |
| Hampton County, VA | 100.0% 100.0% 90.5% 76.4% -89 dBm | 99.6% 99.6% 93.6% 57.7% -108 dBm | 99.3% 99.3% 99.2% 95.2% -78 dBm |
| Hanover County, VA | 99.9% 99.9% 33.8% 22.0% -96 dBm | 92.3% 92.3% 37.1% 27.8% -113 dBm | 79.4% 79.4% 70.1% 49.5% -92 dBm |
| Harrisonburg County, VA | 100.0% 100.0% 75.1% 66.5% -87 dBm | 100.0% 100.0% 98.9% 46.4% -101 dBm | 100.0% 100.0% 100.0% 99.8% -74 dBm |
| Henrico County, VA | 100.0% 100.0% 66.9% 46.9% -93 dBm | 99.5% 99.5% 74.1% 46.7% -108 dBm | 97.2% 97.2% 92.8% 78.8% -86 dBm |
| Henry County, VA | 98.8% 98.8% 20.0% 11.5% -97 dBm | 87.9% 87.9% 23.4% 13.9% -113 dBm | 77.3% 77.3% 65.8% 43.6% -94 dBm |
| Highland County, VA | 21.5% 21.5% 0.0% 0.0% -105 dBm | 10.0% 10.0% 1.6% 1.3% -116 dBm | 7.4% 7.4% 6.1% 3.7% -95 dBm |
| Hopewell County, VA | 100.0% 100.0% 51.6% 19.8% -94 dBm | 100.0% 100.0% 91.9% 70.7% -108 dBm | 100.0% 100.0% 100.0% 96.3% -79 dBm |
| Isle of Wight County, VA | 97.6% 97.6% 45.5% 30.5% -100 dBm | 87.0% 87.0% 27.1% 19.0% -113 dBm | 74.5% 74.5% 65.4% 47.3% -92 dBm |
| James City, VA County | 99.8% 99.8% 41.6% 23.6% -97 dBm | 87.2% 87.2% 30.7% 24.1% -115 dBm | 79.2% 79.1% 70.7% 52.0% -91 dBm |
| King and Queen County, VA | 95.4% 95.4% 9.6% 4.4% -99 dBm | 64.4% 64.4% 25.1% 19.6% -116 dBm | 39.6% 39.6% 29.1% 15.0% -97 dBm |
| King George County, VA | 97.3% 97.3% 17.9% 10.5% -96 dBm | 98.0% 97.9% 74.6% 50.3% -114 dBm | 83.5% 83.3% 73.3% 49.1% -94 dBm |
| King William County, VA | 97.6% 97.6% 23.1% 12.8% -97 dBm | 72.9% 72.9% 34.8% 28.2% -116 dBm | 51.8% 51.6% 39.0% 21.1% -97 dBm |
| Lancaster County, VA | 100.0% 100.0% 35.9% 20.3% -96 dBm | 83.6% 83.6% 39.7% 32.0% -114 dBm | 26.1% 26.1% 20.7% 12.0% -97 dBm |
| Lee County, VA | 63.9% 63.9% 0.3% 0.2% -98 dBm | 63.2% 63.0% 25.2% 20.6% -113 dBm | 34.4% 34.4% 27.9% 19.4% -94 dBm |
| Lexington County, VA | 100.0% 100.0% 73.8% 55.7% -89 dBm | 100.0% 100.0% 93.4% 82.0% -114 dBm | 100.0% 100.0% 100.0% 100.0% -80 dBm |
| Loudoun County, VA | 97.3% 97.3% 45.3% 29.5% -93 dBm | 98.1% 97.2% 91.1% 70.3% -108 dBm | 92.8% 92.8% 87.6% 72.9% -87 dBm |
| Louisa County, VA | 99.4% 99.4% 8.7% 4.5% -97 dBm | 82.9% 79.9% 47.3% 36.5% -114 dBm | 59.9% 59.8% 47.5% 27.0% -96 dBm |
| Lunenburg County, VA | 94.4% 94.4% 6.0% 3.1% -99 dBm | 56.5% 56.4% 13.9% 8.8% -118 dBm | 19.5% 19.5% 13.8% 6.5% -99 dBm |
| Lynchburg County, VA | 100.0% 100.0% 57.8% 39.0% -91 dBm | 98.1% 98.1% 75.7% 42.7% -109 dBm | 93.2% 93.2% 89.8% 77.6% -86 dBm |
| Madison County, VA | 84.4% 84.4% 13.3% 7.9% -98 dBm | 59.3% 57.2% 35.7% 27.4% -115 dBm | 63.5% 63.0% 54.6% 30.9% -95 dBm |
| Manassas County, VA | 100.0% 100.0% 95.9% 82.1% -87 dBm | 100.0% 100.0% 100.0% 75.6% -98 dBm | 100.0% 100.0% 100.0% 100.0% -75 dBm |
| Manassas Park County, VA | 100.0% 100.0% 89.7% 73.1% -86 dBm | 100.0% 100.0% 100.0% 76.9% -101 dBm | 100.0% 100.0% 100.0% 100.0% -75 dBm |
| Martinsville County, VA | 100.0% 100.0% 46.7% 29.4% -89 dBm | 100.0% 100.0% 59.9% 37.4% -110 dBm | 100.0% 100.0% 99.0% 89.3% -86 dBm |
| Mathews County, VA | 100.0% 100.0% 35.5% 17.1% -96 dBm | 68.7% 68.7% 34.7% 30.2% -117 dBm | 71.6% 71.3% 65.0% 38.6% -95 dBm |
| Mecklenburg County, VA | 97.4% 97.4% 7.0% 4.4% -98 dBm | 82.0% 81.9% 45.2% 27.6% -116 dBm | 54.3% 54.3% 41.7% 23.2% -97 dBm |
| Middlesex County, VA | 100.0% 100.0% 26.3% 16.4% -94 dBm | 95.0% 95.0% 64.8% 53.5% -113 dBm | 45.6% 45.5% 36.9% 20.7% -96 dBm |
| Montgomery County, VA | 91.0% 91.0% 28.0% 18.5% -95 dBm | 82.0% 82.0% 36.5% 17.1% -112 dBm | 69.6% 69.6% 64.9% 49.3% -89 dBm |
| Nelson County, VA | 93.3% 93.3% 3.5% 1.9% -98 dBm | 51.9% 51.9% 5.4% 3.8% -112 dBm | 51.3% 50.9% 41.4% 24.6% -96 dBm |
| New Kent County, VA | 96.7% 96.7% 17.6% 9.6% -97 dBm | 91.0% 91.0% 14.2% 12.2% -112 dBm | 77.8% 77.7% 71.3% 47.2% -93 dBm |
| Newport News County, VA | 100.0% 100.0% 85.3% 64.2% -93 dBm | 99.4% 99.3% 87.0% 56.6% -110 dBm | 94.9% 94.9% 93.4% 88.0% -80 dBm |
| Norfolk County, VA | 100.0% 100.0% 95.9% 86.2% -87 dBm | 99.9% 99.9% 99.2% 56.1% -104 dBm | 99.9% 99.9% 99.9% 99.9% -73 dBm |
| Northampton County, VA | 99.8% 99.8% 8.7% 5.4% -90 dBm | 89.1% 89.1% 66.6% 52.5% -115 dBm | 77.2% 77.2% 67.5% 49.3% -94 dBm |
| Northumberland County, VA | 98.8% 98.8% 10.5% 5.9% -95 dBm | 70.5% 63.8% 40.9% 32.0% -116 dBm | 53.9% 53.8% 43.9% 26.2% -96 dBm |
| Norton County, VA | 95.5% 95.5% 43.2% 29.6% -93 dBm | 93.0% 93.0% 5.0% 5.0% -108 dBm | 73.4% 73.4% 66.3% 56.8% -88 dBm |
| Nottoway County, VA | 97.1% 97.1% 11.9% 8.0% -97 dBm | 88.4% 88.4% 56.9% 26.2% -113 dBm | 61.2% 61.1% 52.1% 33.8% -94 dBm |
| Orange County, VA | 98.1% 98.1% 6.9% 3.2% -98 dBm | 93.3% 91.6% 75.1% 56.6% -113 dBm | 73.9% 73.6% 65.1% 41.9% -94 dBm |
| Page County, VA | 73.3% 73.3% 9.4% 5.7% -102 dBm | 70.9% 70.1% 56.6% 48.0% -113 dBm | 60.1% 59.5% 54.8% 39.2% -90 dBm |
| Patrick County, VA | 80.6% 80.6% 5.6% 2.6% -100 dBm | 63.2% 63.2% 9.8% 7.3% -115 dBm | 47.5% 47.5% 37.8% 21.2% -96 dBm |
| Petersburg County, VA | 100.0% 100.0% 61.8% 47.0% -87 dBm | 100.0% 100.0% 89.8% 80.0% -107 dBm | 100.0% 100.0% 99.8% 99.0% -78 dBm |
| Pittsylvania County, VA | 92.4% 92.4% 15.1% 8.4% -99 dBm | 83.8% 83.7% 48.6% 33.0% -115 dBm | 63.4% 63.4% 53.0% 32.9% -95 dBm |
| Poquoson County, VA | 100.0% 100.0% 81.6% 69.4% -93 dBm | 96.3% 96.3% 65.7% 46.6% -110 dBm | 92.9% 92.9% 92.9% 88.2% -87 dBm |
| Portsmouth County, VA | 100.0% 100.0% 97.8% 92.8% -87 dBm | 100.0% 100.0% 94.8% 49.0% -107 dBm | 100.0% 100.0% 100.0% 98.6% -79 dBm |
| Powhatan County, VA | 99.6% 99.6% 14.7% 8.6% -97 dBm | 77.8% 77.8% 18.4% 15.4% -114 dBm | 61.4% 61.4% 51.3% 31.3% -95 dBm |
| Prince Edward County, VA | 91.6% 91.6% 11.7% 7.0% -98 dBm | 83.3% 83.3% 15.3% 11.4% -114 dBm | 48.0% 48.0% 37.7% 22.6% -95 dBm |
| Prince George County, VA | 99.8% 99.8% 17.9% 10.1% -94 dBm | 88.7% 88.7% 18.8% 16.1% -113 dBm | 60.1% 60.1% 49.1% 33.1% -94 dBm |
About The Coverage Data
Coverage and signal estimates are derived by Compare Wireless Carriers from carrier-reported data in the FCC’s National Broadband Coverage Map, last updated in June 2025. “Percent covered” shows how much of the city or ZIP code area has a carrier signal, whether weak or strong. Signal bars show the estimated average signal strength in areas of Virginia where that carrier has coverage.
If a carrier says you should have service but you do not, run a challenge test with the FCC Mobile Speed Test App. The FCC uses those results to check carrier-submitted coverage data and requires a carrier response when enough tests show a pattern of inaccurate coverage reporting.