Whether you're moving to Illinois, passing through on a road trip, or just stopping by to explore Chicago or the scenic Shawnee National Forest, you'll find reliable wireless coverage from Verizon, AT&T, and T-Mobile across most of the state.

Use WhistleOut's coverage checker to instantly check coverage in your hometown in Illinois or anywhere in the United States. Just enter an address, and we’ll show you the strongest signals and best plans for that spot, from a high-rise in downtown Chicago, a suburban home in Naperville, or a lakeside cabin near Galena.

Read on to learn more about Illinois’s coverage and the best phone plan to keep you connected statewide, so you can stream your favorite playlist while driving along Lake Shore Drive, send selfies from Millennium Park, or look up the best coffee shop in historic Springfield.

While all three major carriers perform well in Illinois, AT&T is the most consistent choice for statewide coverage. Even if 5G isn’t available in every area, AT&T’s dependable 4G network keeps you connected when it matters most.

Why it's important to pick the right coverage

Choosing the right wireless provider in Illinois is crucial for staying connected, no matter where your day takes you. Whether you're navigating downtown Chicago, exploring Starved Rock State Park, or traveling through the farmlands of central Illinois, a reliable signal keeps you in touch with loved ones and essential services. Strong coverage isn't just about convenience; it's crucial for GPS navigation, emergency calls, and staying connected in rural areas where Wi-Fi is limited. Selecting a carrier with dependable service where you live, work, and explore helps prevent frustrating dead zones and dropped calls.

If you'd like hands-on assistance finding the best Illinois phone plan, our store locator can help you find a nearby T-Mobile, Verizon, AT&T, or Cricket store in cities like Springfield, Peoria, and Champaign, as well as smaller communities across the state. 

With the right coverage, you'll stay connected from the shores of Lake Michigan to the rolling hills of southern Illinois.

Which carrier's coverage is strongest in Illinois? 

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AT&T offers the best overall coverage in Illinois because its 4G LTE network blankets nearly the entire state. That means you'll have a stable connection no matter where you are, from the state capital of Chicago, all the way down to Cairo, where the Ohio and Mississippi rivers meet. AT&T also has a solid 5G network, which saturates northeastern Illinois and the entirety of southern Illinois.

AT&T delivers strong statewide 5G connectivity with 89.26% coverage, offering faster speeds on its well-developed network. It's best for Illinois residents who want consistent performance and live between Chicago and southern Illinois. AT&T’s 5G excels in Chicago, its suburbs, and downstate regions, though northwestern Illinois remains a weaker spot. 

If raw speed is your priority, T-Mobile dominates with the largest 5G network in the state, covering 97.80% of Illinois. Most of Illinois can get lightning-fast data in urban and suburban areas, but T-Mobile does have some gaps in coverage west of Peoria and in southern Illinois. These pockets without coverage mean you might experience some dead zones there without a connection. 

Verizon, while traditionally stronger in 4G, still provides solid 5G coverage at 71.53%, with particularly reliable service in northeastern Illinois as it continues expanding its network. T-Mobile remains the speed leader for 5G, while Verizon balances growing 5G availability with its exceptional 4G backbone. 

No matter your needs, from statewide reliability to top speeds, Illinois offers strong 5G options across all major carriers.

Locals in Illinois will be pleased to learn that all three major carriers offer solid 4G LTE coverage statewide. That means you'll be able to find a stable connection virtually anywhere you go throughout Illinois.

AT&T leads in 4G LTE coverage, reaching 99.37% of the state, so you can stay connected everywhere from Chicago’s skyscrapers to the farmlands of central Illinois. Verizon is right behind with 99.17% 4G coverage, making it another dependable choice for seamless service in cities and rural areas alike. T-Mobile’s 4G network covers 91.06% of the state, though users may notice occasional gaps, particularly north of Peoria and near Quincy.

AT&T’s near-total 4G coverage ensures strong service whether you’re in Springfield, Galena, or anywhere in between, while Verizon provides very similar 4G reliability. T-Mobile works well in most populated regions but isn’t quite as consistent in remote areas. For travelers who need the broadest coverage, AT&T and Verizon deliver the strongest statewide connections, with T-Mobile excelling more in 5G performance than 4G reach.

AT&T network coverage in Illinois

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AT&T delivers the most reliable wireless coverage across Illinois.With the most extensive 4G LTE network at 99.37% statewide coverage, AT&T ensures strong connectivity in major cities like Chicago and Springfield, as well as rural communities from Galena to Carbondale. The carrier’s 89.26% 5G availability brings high-speed service not just to urban hubs, but also to smaller towns across northern, central, and southern Illinois.

AT&T’s blend of statewide reliability and 5G speeds makes it the top choice for most Illinois residents. While T-Mobile’s 97.80% 5G coverage is the largest in the state, AT&T’s network is more uniformly robust, avoiding the sporadic gaps in T-Mobile’s service (particularly west of Peoria). Verizon’s 99.17% 4G LTE network nearly matches AT&T’s reach but trails in 5G at just 71.53%—making it better for baseline coverage than cutting-edge speeds.

For seamless connectivity in Illinois’ cities, suburbs, and rural stretches, AT&T remains the clear leader.

Check AT&T’s coverage map to test signal strength in your area by toggling between 4G and 5G to see the difference.

Check AT&T’s coverage near you

Best AT&T phone plan

The best AT&T plan for Illinois residents is Unlimited Premium, which includes unlimited premium data, plus 60GB of high-speed mobile hotspot. With Unlimited Premium, you can stream and game seamlessly without slow speeds on AT&T’s 4G and 5G networks. At $85/month, it’s a pricey phone plan, but you can save more by adding lines with an AT&T family plan.

Best phone plans on AT&T's network

The most well-known AT&T MVNO (Mobile Virtual Network Operator) is Cricket Wireless. With Cricket, you can still get AT&T coverage without paying top-tier pricing. Find a Cricket retail location anywhere across the nation and snag one of its competitive data plans on AT&T’s network. 

Cricket’s best plan is the Supreme Unlimited plan. For $55/month, you get unlimited premium data at 5G speeds, hotspot capability, and even a subscription to HBO Max.

While Cricket may be the most well-known MVNO on AT&T's network, the best plan available is Unlimited Starter from US Mobile. For only $25/month, you get unlimited high-speed data, 20GB of hotspot data, and 10GB of domestic roaming data, so your phone will find another partner network to keep you covered even in US Mobile's network gaps.

Red Pocket is another budget-friendly AT&T MVNO with generous 5G data on the AT&T network. Its Premium Monthly Plan includes unlimited talk, text, and 50GB of premium data for only $30/month. You also get 10GB of hotspot data to use when you’re away from Wi-Fi.

Popular phone plans on AT&T's network

Check out the most popular phone plans on the AT&T network:

T-Mobile network coverage in Illinois

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T-Mobile operates on Illinois’ largest 5G network, covering 97.80% of the state, beating both AT&T’s 89.26% and Verizon’s 71.53%. In our testing of T-Mobile’s network, we saw blazing-fast speeds in urban areas, making it ideal for tech-savvy users in cities like Chicago, Aurora, and Naperville.

But while T-Mobile leads in 5G, its 4G LTE coverage tanks third at 91.06% of Illinois, falling behind AT&T’s 99.37% and Verizon’s 99.17%. Rural areas like farmlands around Kankakee, parts of downstate Illinois, or stretches of Interstate 57 may face weaker signals or dead zones. Visitors to remote spots like Shawnee National Forest or smaller towns near the Iowa border should also expect spotty service.

T-Mobile isn’t only Illinois' top 5G provider, but also the nation’s. Check its coverage map below to compare 4G and 5G availability in your area.

Check T-Mobile’s coverage near you

Best T-Mobile phone plan 

The best T-Mobile plan is Experience More, given it’s packed with perks for its price point. For $85/month, Experience More includes unlimited premium data, 60GB of hotspot data, and two free streaming subscriptions (free Netflix with Ads and Apple TV+).

Best phone plans on T-Mobile's network

T-Mobile plans are expensive, but you don’t have to pay top-tier pricing to get access to the T-Mobile network. T-Mobile MVNOs (Mobile Virtual Network Operators) are smaller carriers that operate on T-Mobile’s network, but offer cheaper data plans.

Our favorite T-Mobile MVNO is Mint Mobile. We love its budget-friendly multi-month service plans. You can choose your monthly data limit or opt for unlimited data for stress-free usage. New customers can even get Mint’s Unlimited plan for only $15/month with Mint’s introductory pricing. 

Mint’s Unlimited plan includes 50GB of premium data and a 20GB mobile hotspot to keep your other devices connected while away from home. When we tested Mint's speeds, we were impressed by its consistently high speeds, which exceeded 200Mbps, reaching a peak of 600Mbps.

Tello is another T-Mobile MVNO with cheap data plans. You can decide whether you want capped data or unlimited monthly data. Tello’s $25/month Unlimited Talk, Text, and Data Plan includes 50GB of premium data at 5G/4G LTE speeds—more than enough even for heavy data users—and a 10GB hotspot.

Popular phone plans on T-Mobile's network

Take a look at these popular plans on the T-Mobile network:

Verizon network coverage in Illinois

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Verizon delivers reliable 4G LTE service across 99.17% of Illinois, offering strong connectivity in both urban and rural areas. However, Verizon's 5G network currently reaches just 71.53% of the state, with its fastest Ultra Wideband service concentrated in Chicago and major suburbs. If you live or work in these areas, you'll experience Verizon's premium 5G speeds that we've clocked at over 800 Mbps in our tests.

Verizon's 4G LTE network provides dependable coverage throughout Illinois (even in less populated areas downstate), and is on par with AT&T's 99.37% 4G coverage. Verizon’s coverage is superior to T-Mobile's 91.06% 4G availability, making it the better choice for consistent connectivity outside major metro areas.

Check Verizon’s coverage near you

Best Verizon phone plan

Unlimited Plus is the best Verizon phone plan, bringing you blazing-fast speeds and 5G access. Ideal for Illinois residents in Chicago, Unlimited Plus guarantees the fastest speeds on Verizon’s 5G Ultra Wideband network. Priced at $80/month, it includes unlimited premium data and 30GB of hotspot data.

Verizon customers can also get discounted perks for only $10/month extra, like a Disney Bundle (Disney+, Hulu, and ESPN Select) or a Netflix and HBO Max combo.

Best plans on the Verizon network

Choose a Verizon MVNO to still get access to Verizon’s network without paying Verizon’s hefty pricing. Since MVNOs don't maintain or operate their own towers, the savings are passed on to you, lowering your monthly phone bill. 

The best Verizon MVNO is Visible, which also happens to be owned by Verizon. Visible’s best plan is the $45/month Visible+ Pro plan, which includes unlimited data, unlimited hotspot at 15Mbps, and access to Verizon’s 5G network. You also get two Global Passes a month to stock up or use abroad immediately. 

We tested Visible’s service and loved its reliable signal across both city centers and rural areas.

US Mobile is another competitive MVNO that operates on Verizon’s network. US Mobile’s Unlimited Premium plan (on the Warp network, which connects to Verizon’s) costs $44/month. It includes unlimited premium data and a 50GB mobile hotspot.

Popular phone plans on Verizon's network

Check out these popular plans on the Verizon network:

5G and 4G LTE network speeds in Illinois

Fast networks mean better connectivity across Illinois. By opting for a carrier with a strong 5G network ensures smoother streaming and clear video calling. However, a reliable 4G network is crucial for constant connection statewide.

What it really boils down to for the best carrier is whether you prefer faster speeds or widespread connection.

• For a mobile network that has you covered throughout the entire state, choose AT&T to get reliable coverage on its widespread 4G network.
• If you prioritize the fastest speeds, T-Mobile has the largest and most expensive 5G network in the state, covering 97.80%.
• If you happen to live and work in Chicago, Verizon is an ideal choice. Chicagoans can expect top 4G coverage and 5G speeds with Verizon’s Ultra Wideband technology.

AT&T is the clear choice for overall best mobile coverage among the Big Three.

Still unsure which network to choose? Try an eSIM free trial

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Before you commit to a single carrier, test out all networks through an eSIM free trial. US Mobile, Mint Mobile, and Visible offer free trials of their service, allowing you to compare which one is best for you. You won’t be able to use these trials as full-fledged phone plans, but they should give you enough time to decide which network you can most rely on.