An update is required to use cellular data on iPhone 7 Plus

tanmay912 Said:

"Cellular":

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Updating This:

Thank you for the screenshot. As it reads: "An update is required to use cellular data on this iPhone". So, it seems there was an update that was being performed that never completed. So, perform an update as instructed here: Update your iPhone Using a Computer - User Tip

If you see No Service or Searching on your iPhone or iPad

https://support.apple.com/en-us/HT201415