Coverage rankings for San Bernardino County, CA
AT&T currently ranks first for coverage in this area, with a coverage score of 64.6. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.
| Rank | Carrier | Score | Overall | 4G LTE | 5G | Fast 5G | Average Signal |
|---|---|---|---|---|---|---|---|
| 1 | AT&T | 64.6 | 74.5% | 74.5% | 51.4% | 48.5% | -115 dBm |
| 2 | Verizon | 57.6 | 71.8% | 71.0% | 33.0% | 24.4% | -97 dBm |
| 3 | T-Mobile | 56.6 | 54.8% | 54.6% | 48.1% | 33.9% | -93 dBm |
Scores include coverage area, network type, and average signal strength.
Cell phone coverage map for San Bernardino County, CA
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.
Coverage Key
Less covered More covered
Darker areas mean the carrier covers more of that location.
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 San Bernardino County, CA
#1
AT&T
Coverage Score 64.6
In San Bernardino County, CA
- Overall
- 74.5%
- 4G LTE
- 74.5%
- 5G
- 51.4%
- Fast 5G
- 48.5%
Average Signal -115 dBm
#2
Verizon
Coverage Score 57.6
In San Bernardino County, CA
- Overall
- 71.8%
- 4G LTE
- 71.0%
- 5G
- 33.0%
- Fast 5G
- 24.4%
Average Signal -97 dBm
#3
T-Mobile
Coverage Score 56.6
In San Bernardino County, CA
- Overall
- 54.8%
- 4G LTE
- 54.6%
- 5G
- 48.1%
- Fast 5G
- 33.9%
Average Signal -93 dBm
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Coverage by city in San Bernardino County, CA
Cities and towns are shown for county-level comparison. Coverage percentages use land-area only coverage.
| City | Verizon | AT&T | T-Mobile |
|---|---|---|---|
| Adelanto, CA | 100.0% 100.0% 99.8% 97.5% -87 dBm | 99.9% 99.9% 96.5% 91.7% -115 dBm | 100.0% 100.0% 99.8% 98.9% -77 dBm |
| Amboy, CA | 92.7% 92.7% 0.0% 0.0% -96 dBm | 100.0% 100.0% 100.0% 96.0% -110 dBm | N/A N/A N/A N/A N/A |
| Angelus Oaks, CA | 74.8% 74.4% 35.9% 21.9% -100 dBm | 67.1% 66.9% 42.4% 41.7% -114 dBm | 63.8% 63.8% 55.7% 37.5% -93 dBm |
| Apple Valley, CA | 100.0% 100.0% 99.9% 99.0% -85 dBm | 99.9% 99.9% 99.2% 90.5% -107 dBm | 100.0% 100.0% 99.8% 94.0% -85 dBm |
| Baker, CA | 100.0% 100.0% 0.0% 0.0% -71 dBm | 100.0% 100.0% 100.0% 100.0% -98 dBm | 100.0% 100.0% 100.0% 100.0% -73 dBm |
| Barstow, CA | 100.0% 100.0% 98.9% 96.0% -81 dBm | 100.0% 100.0% 99.8% 98.9% -103 dBm | 100.0% 100.0% 99.9% 97.1% -84 dBm |
| Big Bear City, CA | 89.2% 88.8% 74.7% 61.3% -94 dBm | 85.1% 85.1% 66.3% 66.0% -106 dBm | 75.1% 75.1% 70.3% 57.7% -87 dBm |
| Big Bear Lake, CA | 100.0% 100.0% 100.0% 92.0% -87 dBm | 100.0% 100.0% 99.3% 99.3% -100 dBm | 99.3% 99.3% 98.6% 93.5% -82 dBm |
| Big River, CA | 100.0% 100.0% 96.6% 48.9% -100 dBm | 100.0% 100.0% 93.1% 91.4% -111 dBm | 99.1% 99.1% 94.8% 76.4% -89 dBm |
| Bloomington, CA | 100.0% 100.0% 100.0% 100.0% -80 dBm | 100.0% 100.0% 100.0% 94.9% -105 dBm | 100.0% 100.0% 100.0% 100.0% -75 dBm |
| Bluewater, CA | 100.0% 100.0% 82.6% 73.9% -90 dBm | 100.0% 100.0% 87.0% 87.0% -110 dBm | 100.0% 100.0% 39.1% 39.1% -77 dBm |
| Cedar Glen, CA | 100.0% 100.0% 96.1% 79.2% -94 dBm | 96.8% 96.8% 35.1% 35.1% -109 dBm | 94.2% 93.5% 90.9% 82.5% -84 dBm |
| Cedarpines Park, CA | 97.4% 97.4% 89.5% 50.0% -101 dBm | 78.9% 77.6% 65.8% 39.5% -117 dBm | 92.1% 90.8% 86.8% 63.2% -95 dBm |
| Chino, CA | 100.0% 100.0% 99.5% 97.3% -85 dBm | 100.0% 100.0% 99.8% 98.2% -106 dBm | 100.0% 100.0% 100.0% 98.2% -81 dBm |
| Chino Hills, CA | 93.8% 93.0% 80.6% 62.1% -96 dBm | 85.9% 85.8% 69.5% 67.2% -111 dBm | 84.7% 84.7% 76.3% 62.4% -89 dBm |
| Colton, CA | 100.0% 100.0% 100.0% 100.0% -82 dBm | 99.7% 99.7% 99.4% 89.3% -104 dBm | 99.4% 99.4% 98.6% 96.0% -79 dBm |
| Crestline, CA | 99.0% 99.0% 78.5% 51.0% -99 dBm | 81.8% 80.5% 61.3% 48.3% -113 dBm | 92.4% 91.7% 85.4% 67.5% -92 dBm |
| Daggett, CA | 100.0% 100.0% 91.8% 90.4% -87 dBm | 100.0% 100.0% 99.8% 97.3% -106 dBm | 100.0% 100.0% 100.0% 100.0% -78 dBm |
| Earp, CA | 99.2% 99.2% 80.1% 42.7% -98 dBm | 89.9% 89.9% 57.1% 56.4% -112 dBm | 81.4% 81.4% 72.9% 61.0% -87 dBm |
| Essex, CA | 57.1% 55.0% 31.0% 19.8% -96 dBm | 67.7% 67.7% 41.9% 40.8% -116 dBm | 52.3% 52.3% 45.4% 26.7% -96 dBm |
| Fawnskin, CA | 91.4% 91.4% 78.2% 63.2% -98 dBm | 83.6% 83.6% 69.1% 65.5% -113 dBm | 76.8% 76.8% 65.5% 40.5% -94 dBm |
| Fontana, CA | 100.0% 100.0% 99.6% 97.8% -82 dBm | 100.0% 100.0% 99.8% 95.2% -102 dBm | 100.0% 100.0% 100.0% 99.8% -78 dBm |
| Forest Falls, CA | 38.9% 36.5% 24.9% 11.3% -104 dBm | 40.9% 40.9% 7.9% 7.5% -120 dBm | 20.4% 20.3% 12.5% 3.8% -101 dBm |
| Fort Irwin, CA | 100.0% 100.0% 100.0% 98.7% -79 dBm | 100.0% 100.0% 98.7% 95.3% -104 dBm | 99.3% 99.3% 98.7% 93.3% -83 dBm |
| Grand Terrace, CA | 100.0% 100.0% 72.4% 72.4% -83 dBm | 100.0% 100.0% 100.0% 73.7% -107 dBm | 100.0% 100.0% 100.0% 100.0% -77 dBm |
| Green Valley Lake, CA | 100.0% 100.0% 80.8% 65.3% -96 dBm | 95.0% 95.0% 71.7% 56.6% -114 dBm | 98.2% 97.3% 94.5% 71.7% -88 dBm |
| Helendale, CA | 100.0% 100.0% 92.1% 61.3% -97 dBm | 99.9% 99.9% 93.1% 91.2% -113 dBm | 98.7% 98.7% 89.6% 55.8% -92 dBm |
| Hesperia, CA | 99.7% 99.6% 94.6% 87.9% -86 dBm | 98.8% 98.8% 96.7% 91.2% -106 dBm | 99.3% 99.2% 97.6% 87.9% -84 dBm |
| Highland, CA | 100.0% 99.7% 99.7% 96.7% -83 dBm | 98.5% 98.5% 95.5% 87.5% -106 dBm | 98.7% 98.7% 96.0% 88.0% -84 dBm |
| Hinkley, CA | 98.6% 98.6% 52.3% 33.2% -95 dBm | 98.3% 98.3% 85.3% 82.7% -116 dBm | 99.3% 99.3% 89.6% 58.0% -95 dBm |
| Homestead Valley, CA | 98.7% 98.7% 76.9% 39.9% -98 dBm | 78.9% 78.9% 32.0% 31.8% -119 dBm | 99.6% 99.6% 99.1% 97.2% -79 dBm |
| Joshua Tree, CA | 99.2% 99.1% 90.0% 81.0% -93 dBm | 99.7% 99.7% 95.2% 90.2% -110 dBm | 92.3% 92.3% 82.8% 62.6% -94 dBm |
| Lake Arrowhead, CA | 100.0% 100.0% 91.2% 71.0% -94 dBm | 95.2% 95.2% 73.8% 70.8% -107 dBm | 94.2% 94.2% 87.9% 74.1% -89 dBm |
| Landers, CA | 76.6% 70.5% 53.1% 31.4% -102 dBm | 65.5% 65.5% 35.3% 35.3% -117 dBm | 58.9% 58.8% 41.6% 20.2% -98 dBm |
| Lenwood, CA | 100.0% 100.0% 100.0% 100.0% -84 dBm | 100.0% 100.0% 100.0% 100.0% -105 dBm | 100.0% 100.0% 100.0% 97.7% -89 dBm |
| Loma Linda, CA | 100.0% 100.0% 100.0% 94.3% -85 dBm | 99.0% 99.0% 87.0% 74.1% -108 dBm | 97.9% 97.9% 93.8% 83.4% -84 dBm |
| Lucerne Valley, CA | 99.6% 98.9% 93.5% 83.8% -91 dBm | 97.9% 97.9% 93.1% 89.1% -115 dBm | 98.6% 98.6% 96.4% 83.5% -88 dBm |
| Ludlow, CA | 73.3% 73.3% 0.0% 0.0% -90 dBm | 71.7% 71.7% 5.1% 5.1% -109 dBm | 68.6% 68.6% 64.5% 50.5% -87 dBm |
| Lytle Creek, CA | 97.0% 97.0% 85.0% 67.7% -98 dBm | 12.8% 12.8% 3.8% 3.0% -119 dBm | 36.1% 36.1% 23.3% 8.3% -101 dBm |
| Mentone, CA | 100.0% 100.0% 100.0% 97.7% -87 dBm | 100.0% 100.0% 96.2% 93.2% -108 dBm | 96.2% 96.2% 87.2% 61.7% -95 dBm |
| Montclair, CA | 100.0% 100.0% 100.0% 100.0% -84 dBm | 100.0% 100.0% 100.0% 100.0% -97 dBm | 100.0% 100.0% 100.0% 100.0% -76 dBm |
| Morongo Valley, CA | 90.6% 90.4% 78.9% 63.4% -95 dBm | 83.4% 83.4% 61.2% 60.6% -115 dBm | 69.5% 69.5% 54.7% 26.0% -98 dBm |
| Mountain View Acres, CA | 100.0% 100.0% 100.0% 100.0% -79 dBm | 100.0% 100.0% 100.0% 91.7% -108 dBm | 100.0% 100.0% 100.0% 97.2% -85 dBm |
| Mt Baldy, CA | 31.7% 30.1% 24.8% 12.5% -106 dBm | 20.6% 20.6% 11.4% 6.1% -116 dBm | 16.9% 16.8% 8.3% 2.7% -103 dBm |
| Muscoy, CA | 100.0% 100.0% 100.0% 100.0% -84 dBm | 100.0% 100.0% 100.0% 75.4% -110 dBm | 100.0% 100.0% 100.0% 100.0% -76 dBm |
| Needles, CA | 100.0% 100.0% 96.5% 72.3% -92 dBm | 100.0% 100.0% 100.0% 100.0% -103 dBm | 99.8% 99.4% 98.8% 93.5% -85 dBm |
| Newberry Springs, CA | 79.8% 79.1% 30.3% 22.1% -97 dBm | 79.3% 79.3% 52.4% 37.7% -117 dBm | 78.7% 78.7% 68.8% 54.9% -92 dBm |
| Nipton, CA | 81.2% 81.2% 31.4% 25.3% -97 dBm | 63.6% 63.6% 51.9% 51.4% -113 dBm | 66.4% 66.4% 61.4% 53.4% -88 dBm |
| Oak Glen, CA | 98.8% 98.5% 91.1% 54.8% -99 dBm | 78.2% 78.2% 29.2% 23.4% -119 dBm | 65.5% 65.5% 50.8% 17.2% -100 dBm |
| Oak Hills, CA | 100.0% 100.0% 99.6% 97.0% -83 dBm | 100.0% 100.0% 92.2% 75.0% -114 dBm | 100.0% 100.0% 98.9% 91.1% -85 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 San Bernardino County, CA 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.