Cracked the screen need to replace it... Take it to the Apple Store?
Try to buy the lcd from ebay, you can try to change it by yourself.
there is so much diy tutorial howto change the lcd.
you can try watch from youtube.
try this link: http://www.youtube.com/watch?v=adFN4MZVulI
I guess your warranty from Apple is expired. You can go to your local repair shops to ask them for help. They will charge your some dollars. If you want to replace your iPhone 4 Screen, you can buy a new iPhone 4 LCD Screen from ebay or China Suppliers. And replace it yourself by watching videos on youtube. iPhone 4 LCD Screen Digitizer Touch Assembly Black 
I iphone lcd screen broken, the need to replace the corresponding parts, I have been on this site a full range of help. iphone parts samsung parts iphone 6 parts YDT parts
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