HT206203: If you can't activate your iPhone, iPad, or iPod touch after installing iOS 9.3
Learn about If you can't activate your iPhone, iPad, or iPod touch after installing iOS 9.3
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Q: Safari frozen on i phone after downloading 9.3 - Any suggestions?
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Mar 27, 2016 8:30 AMby Ingo2711,Did you already try to force restart the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again?
You will not lose data by doing that, but it can cure some glitches after installing new software.
If this does not help, resetting the network settings in Settings/General/Reset would be another step to try.
If still not luck, set it back to factory settings and restore from the latest backup:
Use iTunes to restore your iOS device to factory settings - Apple Support
