iOS 15: Cellular Data Not Working on iPhone | Cellular Update Failed error by Apple TechPage September 26, 2021, 4:58 pm 2k Views How to fix Cellular Update failed error on iPhone 13 Pro Max, Cellular Update failed error on iPhone 12 Pro Max, Cellular data not working on iPhone after iOS 15, Mobile data issue on iPhone after iOS 15. . Share this: See more Previous article Tech Up's #386 – WhatsApp Group Calls, Pixel 3 Lite, Fuchsia OS, self-driving bus, Realme earphones Next article Face ID becomes unusable when replacing the display of iPhone 13 with a non-genuine route