CALIFORNIA · STATEWIDE · FCC DATA

Best cell phone coverage in California California, statewide

Verizon reports the widest coverage in California: 64.3% of the area outdoors, 12.9 points ahead of T-Mobile. AT&T is close enough behind to call the top two level.

Carrier-reported coverage from FCC carrier filings as of December 31, 2025, not measured signal. How these figures are read

RESULT · CALIFORNIA

Coverage in California

What stands out in California

  • In 29 of California's 58 counties even the best carrier leaves a quarter or more of the land uncovered; the thinnest is Trinity County, CA.
  • Verizon loses the most of California in a moving car: 64.3% outdoors, 33.6% in a car.
  • 5G at 35/3 Mbps covers 47.7% of California, against 39.4% of the US.
  • T-Mobile reports 51.4% of California outdoors, against 47.3% of the US.
★ WIDEST REPORTED COVERAGE
Verizon
64.3%
Outdoor
64.3%
In car
33.6%

AT&T vs T-Mobile vs Verizon in California

#1
Verizon
Outdoor
64.3%
In car
33.6%
#2
AT&T
Outdoor
57.3%
In car
36.2%
#3
T-Mobile
Outdoor
51.4%
In car
26.8%

4G and 5G across all carriers in California

4G LTE
72.2%
5G 7/1
56.2%
5G 35/3
47.7%

Check your street on each carrier's map

Verizon coverage map → AT&T coverage map → T-Mobile coverage map →

Where coverage runs thin in California

Counties with the least land under 4G LTE from any carrier: Trinity County (35.7%), Inyo County (40.3%), Sierra County (42.1%), Del Norte County (42.9%), Tuolumne County (51.4%). See how California compares in the 10 US states with the least cell coverage.

IF YOU ALREADY GET A WEAK SIGNAL

Would a signal booster help here?

Only sometimes. A booster amplifies a signal that already reaches your roof, window or car; it cannot create coverage. If a phone held outdoors in California shows no bars, it has nothing to amplify. It helps where a usable outdoor signal dies indoors. Check that outdoor signal first, and match the booster to your carrier's bands, not to a headline range figure.

HiBoost signal boosters →

Affiliate link. If you buy through it we may be paid a commission, at no extra cost to you. It never changes which carrier we rank first - that comes from the FCC filings alone.

Coverage in California's largest cities

States with figures closest to California's