What do I do since phone says no cellular data and update is needed
Why is my iPhone saying no cellular data
iPhone 12 mini, iOS 14
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I’d suggest if you haven’t already, to restart your phone as that can solve a lot of problems.
Otherwise this page should help with the lack of a cellular connection:
https://support.apple.com/en-us/HT201415
With regards to updating your phone, can you connect to a stable WiFi network?