Q: Cannot update iPhone 5c to iOS 9.3

Apple has pulled the iOS 9.3 update for some devices (iPad Airs and previous, iPhone 5s and previous) due to problems with activation. You will not be able to update until a fix is issued.

See these articles for details and possible workarounds.

http://www.imore.com/apple-working-ios-93-fix-older-iphone-ipad

https://support.apple.com/en-us/HT206203

https://support.apple.com/en-us/HT206214

A new build for the iPad 2 is now available that does not require the activation step. A new build for the other devices is not yet available.

My wife's iPhone 5c is in the same state - unable to complete the update because the iPhone has no Internet access.  E-mail and Safari work just fine.

If you can't update to iOS 9.3 on your iPhone 5s or earlier, iPad Air or earlier, or iPod touch - Apple Support