iphone4 cracked screen help?

[jaret]

i dropped my iphone 4 on the ground a few minutes ago and now it has a tiny crack starting from the right side going to the other diagonally. Whenever i try to unlock it or do anything it doesnt respond to the touch. The obly thing that works is the play pause forward and backward buttons which appear at the lock screen when you double hit the home button the sound meter doesnt and anything below that doesnt either. How do i fix this or is my phone broken completely? also i have no warranty on it