my iphone shows a notification ' An update is required to use mobile data for this iphone '
See this support article:--> If you see an Update Failed or Apple Pay Not Available alert after iOS update or restart - Apple Support
Thanks Giulio, I have followed the instruction but still the same problem, may be I should go to the Apple Centre
Please try Settings > General > Reset> reset network settings.. ( Before doing any reset, try to backup your data) thanks
Thanks Gwen, had tried that but no luck
Sorry about that but yes, make an appointment and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector
After checking it out, they'll give you all the available options.
Best of luck.