My phone says no service and will not let me turn on cellular data
How can I get my service back or turn my cellular data on?
iPhone 8 Plus, iOS 15
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"My phone says no service and will not let me turn on cellular data: How can I get my service back or turn my cellular data on?"
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Troubleshooting "No Service":
If "No Service" shown on the top-left corner of your screen, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support
Note: You need to have service, in order to enable Cellular. So, that is why you cannot enable it.