I am on my second iPhone now, and have had problems with since. My battery will not fully charge, it will always think that it is not fully charged, no matter how long I leave it on the charger for. My speaker is very quiet, when compared to other iphones. And I have some really bad multi-touch issues - like touching in one section of the screen and the screen thinking I'm hitting another section. Has anyone had any luck replacing their phones with these issues? Is it better to go into the Apple Store or just call 1-800-IPHONE?