why can’t I update my phone
My phone won’t let me make calls going in or out. When I try to update my phone it won’t let me, but it tells me I need an update to use my phone properly.
iPhone 11, iOS 15
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See -> If you can't make or receive calls on your iPhone
If you can't make or receive calls on your iPhone - Apple Support
See also 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
Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)