For a typical 5-7 day trip to Illinois, especially if you plan on using navigation extensively, streaming, and social media, a Cellesim eSIM with 5 GB to 10 GB of mobile data is usually sufficient. If you'll be uploading many photos or video calling frequently, consider a 15 GB plan to stay connected without worry throughout your visit to the Prairie State.
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How much data (GB) do I need for a trip to Illinois?
Updated May 30, 2026
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