4G LTE & 5G Coverage In Diamond Bar

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

Network	4G Coverage	5G Coverage
AT&T	100%	99%
T-Mobile	84%	88%
Verizon	99%	86%
Dish	0%	19%

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

US Cellular And Dish Roaming Coverage

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

The 19% figure for Dish may understate what subscribers in Diamond Bar experience after accounting for roaming agreements.

Diamond Bar Cell Signal Strength

There are 325 map hexes within the census-defined boundaries of Diamond Bar. 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	33%	61%	7%	0%
T-Mobile	28%	49%	16%	8%
Verizon	16%	69%	15%	1%
Dish	0%	10%	9%	81%

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

Crowdsourced Coverage Data In Diamond Bar

Coverage Critic has 12,040 crowdsourced data points from 134 map hexes within the boundaries of Diamond Bar. Data is available for AT&T, T-Mobile, and Verizon.

Network	Unique Hexes	Total Observations
AT&T	104	3,271
T-Mobile	129	7,896
Verizon	63	786

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

California State-Wide Coverage Scores

Network	Coverage Score
Verizon	8.8 / 10
AT&T	8.6 / 10
T-Mobile	8.2 / 10

Data Confidence

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