4G LTE & 5G Coverage In California

The table below shows the proportion of California with coverage from different cellular technologies.

Network	4G Coverage	5G Coverage
AT&T	100%	95%
T-Mobile	98%	97%
Verizon	100%	91%
Dish	0%	100%

Don't be alarmed by Dish's lack of 4G coverage in California. Dish has a newly-built network that's 5G-only.

US Cellular And Dish Roaming Coverage

US Cellular does not have native coverage in California. However, some US Cellular subscribers may still have coverage in California thanks to roaming agreements.

California Cell Signal Strength

There are 360 map hexes within the census-defined boundaries of California. The table below shows the proportion of hexes at various levels of signal strength. Where both 4G and 5G coverage is available, data is drawn from whichever technology offers a stronger signal.

Network	Strong	Decent	Weak	None
AT&T	2%	31%	67%	0%
T-Mobile	15%	63%	20%	2%
Verizon	19%	71%	10%	0%
Dish	19%	73%	8%	0%

For most purposes, decent signals are perfectly sufficient. Weak or non-existent signals cause far greater degradation in user experience.

Crowdsourced Coverage Data In California

Coverage Critic has 140 crowdsourced data points from 25 map hexes within the boundaries of California. Data is available for AT&T only.

Network	Unique Hexes	Total Observations
AT&T	25	140
T-Mobile	0	0
Verizon	0	0

Click here to toggle to the map's crowdsourced data layer.

Maryland State-Wide Coverage Scores

Network	Coverage Score
Verizon	8.7 / 10
AT&T	8.7 / 10
T-Mobile	8.3 / 10

Data Sourcing

Coverage maps draw on data from the FCC's Broadband Data Collection and Coverage Critic's crowdsourcing.

The coverage information for California is rated as medium-high confidence. Documentation is available elsewhere covering limitations of Coverage Critic's approach.