California
Cell coverage comparison in California, United States
Based on crowdsourced speed tests and signal measurements in California, United States, the current snapshot reflects over 1.4 million speed tests and shows medians of 110.5 Mbps download, 12.5 Mbps upload, and 38 ms latency.
Performance by Carrier in California
Explore median download speeds, upload performance, and network latency for each major mobile carrier in California, calculated from millions of real-world, crowdsourced speed tests. These results reflect typical everyday performance to help you compare carriers and choose the network that delivers the fastest speeds, most responsive connections, and broadest coverage where you live, work, and travel.
Over 340,000 tests conducted
Over 450,000 tests conducted
Over 580,000 tests conducted
Performance by Carrier shows side-by-side results for the primary mobile providers measured in California. Each row reflects median download, upload, and latency for that carrier.
Providers included in this comparison are Verizon, T-Mobile, AT&T. Per-carrier test counts are shown in the table to indicate data accuracy.
Network Performance in California
Get a complete view of mobile network performance across California with overall benchmarks and carrier-by-carrier breakdowns. Explore median performance metrics calculated from millions of real-world, crowdsourced speed tests. Start with the California-wide snapshot to understand overall network trends, then dive deeper to compare individual carriers side-by-side and see how each performs in speed, responsiveness, and availability.
Median Performance
Download
Upload
Latency
Top Performers
Fastest Download: T-Mobile
182.2 Mbps
Fastest Upload: Verizon
14.0 Mbps
Best Latency: AT&T
34 ms
Best Coverage: Verizon
70.5%
Coverage Snapshot
Network Performance aggregates all measured carriers in California to provide a baseline view of typical speeds and latency in the area. Use these medians as a quick indicator of overall network quality.
These medians are calculated from over 1.4 million tests. Current medians are 110.5 Mbps download, 12.5 Mbps upload, and 38 ms latency.
Cell Phone Plans Available in California
Compare wireless plans from carriers with coverage in this region.
Red Pocket 500MB 12 Months
12 month term
- 0.5 GB Datahigh-speed, then Unknown
- Hotspot Included
- 500 Minutes
- 500 Texts
US Mobile Light Plan Annual
12 month term
- 2 GB Datahigh-speed, then data stops
- No Hotspot Included
- Unlimited Minutes
- Unlimited Texts
- Taxes & Fees Included
TextNow Weekly Unlimited
Monthly plan
- 20 GB Datahigh-speed, then data stops
- Hotspot Included
- Unlimited Minutes
- Unlimited Texts
- Taxes & Fees Included
Red Pocket Essentials Annual
12 month term
- 3 GB Datahigh-speed, then 256Kbps
- No Hotspot Included
- Unlimited Minutes
- Unlimited Texts
Red Pocket Essentials
Monthly plan
- 3 GB Datahigh-speed, then 256Kbps
- No Hotspot Included
- Unlimited Minutes
- Unlimited Texts
Red Pocket Essentials (AT&T)
Monthly plan
- 3 GB Datahigh-speed, then 256Kbps
- No Hotspot Included
- Unlimited Minutes
- Unlimited Texts
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Cell Coverage in California: FAQ
What is the best cell phone carrier in California?
Why might this page show limited data for California?
How can I check coverage at my specific address in California?
How can I contribute coverage data for California?
Download the CoverageMap app and run a few speed tests with location enabled. Your results help improve coverage accuracy and unlock local rankings faster.
Get the appCheck Coverage at Your Exact Location
Use our interactive coverage map to see detailed signal strength data for any address in California.
Open Interactive Map