Updating to iOS 7.
If you had updated your iPhone 4S To iOS 7.0.3 From iOS 6.1.3 Would it brick your iPhone?
iPhone 4S, iOS 6.1.3
If you had updated your iPhone 4S To iOS 7.0.3 From iOS 6.1.3 Would it brick your iPhone?
iPhone 4S, iOS 6.1.3
It shouldn't. If it did Restore it in iTunes.
You should be fine, Just take precautions and backup your phone.
Updating to iOS 7.