What’s the phone number to call for help
my phone won’t allow me to make calls because of a cellular update and I do not have a computer what do I do
Do you have wi-fi?
Click on the link and read how to Update your carrier settings on your iPhone or iPad --> https://support.apple.com/HT201270
If you see a [Cellular] Update Failed or Apple Pay Not Available alert after iOS update or restart, click here --> https://support.apple.com/HT208733
More suggestions in this March 2021 post by a Community Specialist - https://discussions.apple.com/thread/252585897?answerId=254877196022#254877196022