My phone is saying no service in the corner it was working with giffgaff
My iPhone is saying no service but was working with giffgaff
iPhone 8 Plus, iOS 15
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Was Giff Gaff, so what are you using now? If it is not O2 based do you have a signal where you are for the new service provider?
Support article: If you see No Service or Searching on your iPhone or iPad - Apple Support
Go through all the various suggestions in the support article above but if they don't help, and your network carrier can't help, then contact Apple Support for further investigation. You should be able to reach them here
Contact - Official Apple Support