For some reason the other day the G on the screen that says i have service dissapeared. it hasnt come back in like 2 days and i have absolutely no service and none of my notes or contacts or anything is showing up. One of the tips i got was to turn my wireless conenction off and then back on, but when i tried to turn it back on it said i had a hardware problem and couldnt. what can i do to fix this?