iPhone isn’t picking up 4G since the last update
Since the last update my phone isn’t picking up 4G when I’m out and also my texts are saying failed message and time sensitive
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iPhone 12, iOS 15
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These two articles might help:
View or change cellular data settings on iPhone - Apple Support
If you see No Service or Searching on your iPhone or iPad - Apple Support
If these won't work, I would go to the retailer where you get your service from or visit an apple store.