Cellular update failed
Cannot make or receive calls
iPhone XS Max
Molar99 Said:
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Q1. "Cellular update failed"
A1. This is not an option:
Your iPhone model(iPhone XS Max) cannot be updated via cellular.
Use an iPhone 12 or later, that is using 5G, in order to update over Cellular - User Tip
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Q2. "Cannot make or receive calls"
A. Go Here: If you can't Make or Receive Calls on your iPhone - Apple Support