California
Cell coverage comparison in California, Maryland
Based on crowdsourced speed tests and signal measurements in California, Maryland, the current snapshot reflects over 100 speed tests and shows medians of 41.9 Mbps download, 9.7 Mbps upload, and 42 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 100 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: AT&T
75.2 Mbps
Fastest Upload: T-Mobile
12.7 Mbps
Best Latency: T-Mobile
41 ms
Best Coverage: Verizon
100.0%
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 100 tests. Current medians are 41.9 Mbps download, 9.7 Mbps upload, and 42 ms latency.
Cell Phone Plans for California
Compare wireless plans from carriers with coverage in this area.
Helium Mobile Zero
Monthly plan
- 1 GB Data1GB cellular + 2GB Helium Wi-Fi
- No Hotspot Included
- 100 Minutes
- 300 Texts
Helium Mobile Sprout
Monthly plan
- 3 GB Datahigh-speed, then data stops
- No Hotspot Included
- Unlimited Minutes
- Unlimited Texts
Red Pocket 500MB 12 Months
12 month term
- 0.5 GB Datahigh-speed, then Unknown
- Hotspot Included
- 500 Minutes
- 500 Texts
Tello 100 Mins
Monthly plan
- No Data Included
- No Hotspot Included
- 100 Minutes
- Unlimited Texts
Tello 1GB 100 Mins
Monthly plan
- 1 GB Datahigh-speed, then data stops
- Hotspot Included
- 100 Minutes
- Unlimited Texts
Tello 2GB 100 Mins
Monthly plan
- 1 GB Datahigh-speed, then data stops
- Hotspot Included
- 100 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.
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