How Do I fix the message that says of cellular error
How do I fix cellular error
iPhone 7, iOS 15
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Try first to optimize the range of the mobile network, see this Apple article:
If you see No Service or Searching on your iPhone or iPad
https://support.apple.com/en-us/HT201415
See these Apple articles below:
Manually update your carrier settings on your iPhone or iPad
Manually update your carrier settings on your iPhone or iPad - Apple Support
Update your network provider settings manually on your iPhone or iPad
https://support.apple.com/en-gb/HT201270
Contact your carrier.