I have an iPhone 4 and the home button has been really sticky as of late and it always seems to drop calls. I called my phone provider and they claim it's my phone. The phone is still in warranty with apple. My question is, the phone has some normal wear and tear, scratches and small dings around the casing. Do you think apple will replaced my phone with another or they will try to service the insides and I will be without the phone for a while.