Cell phone coverage map for San Francisco County, CA
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Map data © OpenStreetMap contributors, © CARTO. Rendered with MapLibre. FCC BDC mobile coverage processed by Carrierlytics.
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Cell phone coverage rankings by network in San Francisco County, CA
T-Mobile
- Overall
- 99.2%
- 4G LTE
- 99.2% avg. -83 dBm 4G LTE signal where 4G LTE coverage exists: avg. -83 dBm
- 5G
- 95.9% avg. -80 dBm 5G signal where 5G coverage exists: avg. -80 dBm
- Fast 5G
- 90.1% avg. -79 dBm Fast 5G signal where Fast 5G coverage exists: avg. -79 dBm
Verizon
- Overall
- 99.8%
- 4G LTE
- 99.8% avg. -73 dBm 4G LTE signal where 4G LTE coverage exists: avg. -73 dBm
- 5G
- 98.9% avg. -86 dBm 5G signal where 5G coverage exists: avg. -86 dBm
- Fast 5G
- 92.5% avg. -86 dBm Fast 5G signal where Fast 5G coverage exists: avg. -86 dBm
AT&T
- Overall
- 99.2%
- 4G LTE
- 99.1% avg. -89 dBm 4G LTE signal where 4G LTE coverage exists: avg. -89 dBm
- 5G
- 98.3% avg. -95 dBm 5G signal where 5G coverage exists: avg. -95 dBm
- Fast 5G
- 68.7% avg. -92 dBm Fast 5G signal where Fast 5G coverage exists: avg. -92 dBm
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 city in San Francisco County, CA
Cities and towns are shown for county-level comparison. Coverage percentages use land-area only coverage.
| City | Verizon | AT&T | T-Mobile |
|---|---|---|---|
| San Francisco, CA | 99.8% 99.8% 98.9% 92.5% | 99.2% 99.1% 98.3% 68.7% | 99.2% 99.2% 95.9% 90.1% |
| Alameda, CA | 100.0% 100.0% 99.6% 96.3% | 100.0% 100.0% 100.0% 73.8% | 100.0% 100.0% 99.6% 98.8% |
| Brisbane, CA | 100.0% 100.0% 97.1% 82.4% | 100.0% 100.0% 100.0% 66.2% | 100.0% 100.0% 100.0% 100.0% |
| Daly City, CA | 100.0% 100.0% 97.8% 94.4% | 100.0% 100.0% 98.9% 68.5% | 100.0% 100.0% 97.2% 93.3% |
| Tiburon, CA | 100.0% 100.0% 78.7% 27.8% | 89.8% 88.9% 75.0% 21.3% | 95.4% 95.4% 91.7% 67.6% |
About The Coverage Data
Coverage and signal estimates are derived by Carrierlytics 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 Francisco 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.