Cellular issue following iOS update
I have a cellular issue following iOS 15.6 update How do I update my mobile data?
iPhone 12 Pro Max, iOS 15
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See this link and follow the instructions provided
If you see No Service or Searching on your iPhone or iPad - Apple Support
if you need to do a carrier settings update
To manually check for and install a carrier settings update:
- Make sure that your device is connected to a Wi-Fi or cellular network.
- Tap Settings > General > About. If an update is available, you'll see an option to update your carrier settings.
- To see the version of carrier settings on your device, tap Settings > General > About and look next to Carrier.
If you insert a new SIM card into your iPhone or iPad, you need to download the carrier settings for your new carrier.