I have format my phone and when I switched on it says unable to activate and update is required to activate iPhone
I have reset my phone now it’s not working
iPhone XR
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See these Apple articles below:
If you can't activate your iPhone or iPad (Wi-Fi + Cellular)
If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support
If you see No Service or Searching on your iPhone or iPad
If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support
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
Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)