I dropped my phone a couple months ago and put 2 small cracks in the screen. Everything worked fine. a few weeks after, I dropped in water but not enough to make the stickers red in the back. Out of nowhere today, my touch screen stopped responding. Phone calls, texts, emails, etc all come in with no problem. Home screen, volume and lock buttons work fine but nothing on the touch screen will respond. What could be the problem and what do I need to fix it? I believe T Mobil said that the warranty may be voided if the screen is cracked...