jannat32 Said:
"Software update : I am installing ios 15.7 in my i phone 7 but while installing it’s showing that you’re not connected to internet…even i deleted the old version first then installed…along with this issue my phone is showing no service on top and I can’t use sim card what do i do now?"
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Troubleshooting Updates:
I. "No Service":
Is "No Service" shown on the top-left corner of your screen? If so, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support
II. Updating an iPhone:
What to Update: Installed apps and the iOS.
1. Back Up First:
IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update
then...
2. Proceed with the Update:
Computer: Update your iPhone Using a Computer - User Tip