I have the Samsung Gravity Smart from Tmobile and for some reason the touch screen isn't working at all. It worked fine earlier, however when I tried to use it again the touch screen nor the touch activated menu/back/search keys would work. the home button works fine so does the lock/power button. Keep in mind this phone is brand new. Got it about a month ago. Tried rebooting it but didn't work. Does anyone have any solutions? What should I do?