AT&T, T-Mobile and Verizon all report outdoor coverage of between 99.1% and 100% of San Bernardino, CA, so no carrier wins on outdoor coverage here. In a moving car the filings differ more: Verizon reports 97.1% against 88.8% for AT&T.
Figures are the share of San Bernardino's area where each carrier reports 4G LTE or 5G service to the FCC, as of December 31, 2025. A state or city figure can hide dead spots, so check your own ZIP code below.
The three carriers report outdoor coverage within 0.9 points of each other here, so coverage alone won't decide it. In a moving car Verizon reports the most (97.1%). Compare plans on price and data instead.
Outdoor coverage range across AT&T, T-Mobile and Verizon. Each carrier's own figures are below.
Outdoor is the share of the area where the carrier reports 4G LTE or 5G to a phone standing still outdoors; in car is the share it reports to a phone in a moving vehicle, which is always lower. Indoor signal is not part of the FCC filing and can be weaker than either.
Share of San Bernardino's area where at least one carrier reports each technology outdoors. "5G 7/1" means 5G of at least 7 Mbps down and 1 Mbps up, "5G 35/3" at least 35/3 Mbps, the two speed tiers the FCC publishes. The FCC summary does not split 5G by carrier.
All three carriers report about the same coverage in San Bernardino, so price, data allowance and contract terms can decide it. Check the street you live on in each carrier's own map before you commit, because a city-wide share can hide a dead spot.
AT&T, T-Mobile and Verizon all report outdoor coverage of between 99.1% and 100% of San Bernardino, CA, so no carrier wins on outdoor coverage here. In a moving car the filings differ more: Verizon reports 97.1% against 88.8% for AT&T.
Across all carriers, 100% of San Bernardino's area has 5G of at least 7/1 Mbps and 99.1% has 5G of at least 35/3 Mbps outdoors, in filings to the FCC as of December 31, 2025.
From the FCC National Broadband Map. Each carrier files where it offers mobile broadband; the FCC publishes the share of each city's area inside that filing. They are carrier-reported, not measured, so check the carrier's own map for your exact address before you switch.
See the statewide California comparison, or coverage in Los Angeles, San Diego, San Jose, San Francisco, Fresno, Sacramento, Long Beach, Oakland, Bakersfield, Anaheim, Stockton, Riverside.
