Unable to update
Unable to update to latest iOS
download and install option is not showing even I am connected to wifi
iPhone 12, iOS 14
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Best reply
1.
The range of the mobile network is minimal.
Do not wait until 'No service' appear.
See this Apple article:
If you see No Service or Searching on your iPhone or iPad
https://support.apple.com/en-us/HT201415
2.
Your iPhone connected to the Internet through the Personal Hotspot of another iOS device.