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Illinois
Cell coverage comparison in Illinois, United States
Based on crowdsourced speed tests and signal measurements in Illinois, United States, the current snapshot reflects over 450,000 speed tests and shows medians of 102.5 Mbps download, 9.8 Mbps upload, and 47 ms latency.
Performance by Carrier in Illinois
Explore median download speeds, upload performance, and network latency for each major mobile carrier in Illinois, 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.
DownDownload85.6 Mbps
UpUpload7.9 Mbps
Reliab.Reliability8.6 / 10
Cov.Coverage98.6%
Over 100,000 tests conducted
DownDownload380.3 Mbps
UpUpload25.0 Mbps
Reliab.Reliability9.6 / 10
Cov.Coverage87.1%
Over 110,000 tests conducted
DownDownload67.3 Mbps
UpUpload7.0 Mbps
Reliab.Reliability4.1 / 10
Cov.Coverage98.8%
Over 230,000 tests conducted
Performance by Carrier shows side-by-side results for the primary mobile providers measured in Illinois. Each row reflects download, upload, latency, and reliability 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.
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Network Performance in Illinois
Get a complete view of mobile network performance across Illinois with overall benchmarks and carrier-by-carrier breakdowns. Explore median performance metrics calculated from millions of real-world, crowdsourced speed tests. Start with the Illinois-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
102.5Mbps
Upload
9.8Mbps
Latency
47ms
Reliability
6.5/ 10
Top Performers
Best Download: T-Mobile
380.3 Mbps
Best Upload: T-Mobile
25.0 Mbps
Best Latency: T-Mobile
28 ms
Best Reliability: T-Mobile
9.6 / 10
Best Coverage: Verizon
98.8%
Coverage Snapshot
5G90.2%
4G LTE99.6%
Based on over 450,000 speed tests
Network Performance aggregates all measured carriers in Illinois 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 450,000 tests. Current medians are 102.5 Mbps download, 9.8 Mbps upload, and 47 ms latency.
Cell Phone Plans Available in Illinois
Compare wireless plans from carriers with coverage in this region.
Recommended PlanSponsored
Mint Mobile 5GB Annual
$15/mo
12 month term
T-Mobile
- 5 GB Datahigh-speed, then 128Kbps
- Hotspot Included
- Unlimited Minutes
- Unlimited Texts
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US Mobile 5GB
$15/mo
Monthly plan
AT&T
T-Mobile
Verizon
- 5 GB Datahigh-speed, then data stops
- Hotspot Included
- Unlimited Minutes
- Unlimited Texts
- Taxes & Fees Included
Recommended PlanSponsored
US Mobile Unlimited Starter Dark Star
$25/mo
Monthly plan
AT&T
- Unlimited Datahigh-speed
- 20 GB Hotspot
- Unlimited Minutes
- Unlimited Texts
- Taxes & Fees Included
Recommended PlanSponsored
Visible Base
$25/mo
Monthly plan
Verizon
- Unlimited Datahigh-speed
- Unlimited Hotspot
- Unlimited Minutes
- Unlimited Texts
- Taxes & Fees Included
Recommended PlanSponsored
Mint Mobile Unlimited Annual
$30/mo
12 month term
T-Mobile
- Unlimited Datahigh-speed
- 20 GB Hotspot
- Unlimited Minutes
- Unlimited Texts
Limited-time offer
$15/mo first year
Recommended PlanSponsored
Visible+
$35/mo
Monthly plan
Verizon
- Unlimited Datahigh-speed
- Unlimited Hotspot
- Unlimited Minutes
- Unlimited Texts
- Taxes & Fees Included
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Browse by Counties
Select one of the counties to view coverage data for that area.
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Cell Coverage in Illinois: FAQ
What is the best cell phone carrier in Illinois?
Based on crowdsourced speed tests in Illinois, T-Mobile currently leads in median download speeds. Compare carriers in the performance table above for the latest results.
Why might this page show limited data for Illinois?
We need at least 25 recent speed tests to generate reliable local metrics. If we don't have enough tests yet, the page focuses on maps and nearby locations while we keep collecting data.
What is the reliability score?
The reliability score summarizes how dependable mobile performance is in Illinois. It uses a 0.0 to 10.0 scale (higher is better) and is calculated from real-world speed test percentiles with weighted components: download (50%), latency (30%), and upload (20%). It evaluates the lower-end experience using the bottom 10%, 5%, and 1% percentiles when enough samples are available. If local speed testing is limited, a coverage-based fallback is used from signal quality distribution (great/good/poor).
How can I check coverage at my specific address in Illinois?
Use the interactive map to check signal strength at your exact address. Visit the CoverageMap interactive map to explore 4G/5G availability.
How can I contribute coverage data for Illinois?
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 Illinois.
Open Interactive Map