IPhone 4 touch screen not responding - what needs replacing?

My iPhone 4 screen has been cracked for a while but the screen has still been responding. However, after another recent drop, half of the screen has now stopped responding to touches all together.

I need to get it repaired, and am planning to send it to a repair service that I have used on my old iPhone 3G, but I'm not sure if the service that they offer (Original Glass, Digitiser & Retina LCD Replacement) is what I need in order to get my touch screen working again.

Could someone confirm that this repair would not only replace the screen but get it working again too?

The screen needs to be replaced

The digitizer, and the rest of the components must be replaced. For 100-200$, Apple will fix your phone. Phone them to set it up for shipping, or go to the nearest Apple store. If you don't get your screen replaced through Apple, it will void your warranty.

Apple's number: 1 (800) 692-7753

Yes, you can buy one here: http://www.yoyobase.com/wholesale-iphone-accessories/wholesale-iphone-screen-replacement.html

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