Best cell phone plan for Illinois
Illinois divides cleanly into the Chicago metro (~9 million people) and downstate (~3.5 million across a much larger area). Carrier choice depends heavily on which side you're on.
Chicago metro
Chicago is one of T-Mobile's strongest US markets — the carrier's 5g-mid-band">mid-band 5G coverage is dense throughout the Loop, North Side, and across the suburbs to the north and west. Verizon has the best building penetration in the older buildings of the Loop and downtown high-rises. AT&T is competitive but typically third.
For Chicago commuters: the CTA Red and Blue lines have improved underground coverage in the last two years; Metra commuter rail has reliable LTE on all branches. If you depend on cellular for work calls during a commute, Verizon is the most consistent train-side network.
Downstate
- Springfield, Peoria, Champaign-Urbana: Verizon strongest, AT&T second, T-Mobile weakest of the three.
- Rockford, Quad Cities: All three competitive in city centers.
- Carbondale and the south: Verizon dominant, T-Mobile has notable gaps.
- Rural farmland (most of the state by area): Verizon is the practical choice. AT&T's FirstNet build-out has improved rural coverage modestly since 2023.
MVNO options
Chicago metro residents who want Verizon coverage at MVNO prices: Visible, US Mobile, Total by Verizon, or Xfinity Mobile (if you're an Xfinity internet customer — Comcast is the dominant cable provider in Chicago). T-Mobile MVNOs like Mint, Tello, and Google Fi all work well in the metro but degrade downstate. AT&T's Cricket is solid if you want a balanced cost/coverage option.
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Frequently asked questions
- Which carrier has the best cell coverage in Illinois?
There is no single best carrier for all of Illinois — coverage varies meaningfully by neighborhood and by underlying network. Verizon is historically strongest in older brick housing and rural reach; T-Mobile leads in 5g-mid-band">mid-band 5G speed in dense urban areas (especially their 5G UC layer); AT&T is competitive throughout. The page above breaks down which network wins in each part of the state.
- What is the cheapest cell phone plan available in Illinois?
The cheapest mainstream plans available in Illinois are the same as anywhere else in the US — Tello starts at $5/month for 1GB on T-Mobile, Mint Mobile from $15/month, US Mobile from $10. Our plans index lists every plan we have on file with prices and underlying networks. The right "cheap" plan depends on which underlying network has the best coverage at your address.
- How do I check cell coverage at my exact address in Illinois?
Enter your ZIP in the finder above to see strong/fair/poor/none coverage classification for the underlying networks at your specific address. Our data comes from the FCC's public Broadband Data Collection — the same dataset most coverage tools rely on. You can also visit a specific carrier's own coverage tool for street-level certainty.
- Are MVNO plans good in Illinois?
MVNOs in Illinois have the same coverage as the underlying MNO they ride — Mint Mobile (T-Mobile), Visible (Verizon), Cricket (AT&T) all use their parent network's towers. The tradeoff is deprioritization during congestion: at packed venues or rush-hour towers, postpaid customers are served first. For most everyday use in Illinois, the experience is indistinguishable from postpaid at half the price.
- Does Illinois get 5G coverage?
Yes — all three major networks (Verizon, T-Mobile, AT&T) offer 5G in Illinois. The relevant question is which 5G layer: low-band 5G is broad but slow (similar to LTE speeds), mid-band 5G is the fast workhorse (200-700 Mbps), and mmWave is gigabit-class but only in dense urban cores and stadiums. Use our state-by-state coverage maps to see which layer is lit up at your address.