Iphone froze because of ios9 update?

I "updated" my phone hours ago and it still hasn't turned on! It says "update complete" but then It freezes on a white screen that says "slide to update"… I have tried pressing the lock and home button, connecting it to my laptop, and plugging it in, in different outlets. I need my phone for school and work by tomorrow!

Sounds right to me. Like apple says "It just works'. Everytime. Don't mean it will work every time