Update Failure
When I try to update to iOS 15.3.1 on my iPhone 11 it fails, the feedback is that software update failed because device is not connected to the internet.
iPhone 11, iOS 14
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You can update your iPhone to iOS 15.x
1.
You need about 7 GB device storage, see this Apple articles below:
If you need more space for an update on your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT203097
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How to check the storage on your iPhone, iPad and iPod touch
https://support.apple.com/en-gb/HT201656
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Clear Other storage on your iPhone or iPad
https://support.apple.com/en-us/HT211686
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What's the difference between device storage and iCloud storage?
https://support.apple.com/en-us/HT206504
2.
Check 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
3.
Check also the Wi-Fi network, see this Apple article: If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
https://support.apple.com/en-us/HT204051
4.
See also the following Apple articles:
Update your iPhone, iPad, or iPod touch
https://support.apple.com/en-in/HT204204
If your iPhone, iPad or iPod touch won’t update
https://support.apple.com/en-us/HT201435
5.
If they are On, turn Off Hotspot & VPN.