How do I fix it on a iPhone 7
How do I fix the cellar data issue on my iPhone 7?
iPhone 7, iOS 13
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Thats not good and I can understand that this can be very frustrating. Have you tried the steps listed in this link If you see No Service or Searching on your iPhone or iPad - Apple Support ? If that does NOT help then your iPhone 7 may be part of the iPhone 7 Repair program and you can check whether you qualify by using the information in this link iPhone 7 Repair Program for "No Service" Issues - Apple Support .
You an also, as always, take your iPhone 7 to an Apple Store and have it examined. Good Luck.