Telling me I need do update but won’t let me
Telling me I have an error when go use cellular data don’t no where to go to correct issue
iPhone 6, iOS 12
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Use the Get Support link at the top of the page here to contact Apple Support. If you have an Apple Store close by, you can make a Genius Bar appointment to have Apple check the iPhone. They will explain your options. Genius Bar Reservation and Apple Support Options - Apple