Why can’t I update my phone to IOS 15.3
Why can’t I update my phone to IOS 15.3 it keeps telling me to update can’t be installed
iPhone 13, iOS 15
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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
How to check the storage on your iPhone, iPad and iPod touch
https://support.apple.com/en-gb/HT201656
Clear Other storage on your iPhone or iPad
https://support.apple.com/en-us/HT211686
What's the difference between device storage and iCloud storage?
https://support.apple.com/en-us/HT206504
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
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
See also the following Apple articles:
If your iPhone, iPad or iPod touch won’t update
https://support.apple.com/en-us/HT201435
You can do the update via PC, see this Apple article: Update software on iPhone, iPad or iPod touch in iTunes on PC
https://support.apple.com/en-gb/guide/itunes/itns3235/windows
If you have a Mac see this Apple article: Update your iPhone, iPad, or iPod touch with the Finder
https://support.apple.com/en-us/HT212185
Hotspot & VPN -> turn Off.