Updatings
How can I update my iPhone 7 to iOS with the use of WiFi not mobile data
But the photo indicates the update is downloaded and just needs installing, so no wifi or data is needed from this point on
2 replies
Try to optimize the range of the mobile network, see this Apple article:
If you see No Service or Searching on your iPhone or iPad
https://support.apple.com/en-us/HT201415
Then try again -> click Install now.
Updatings