My 2 yr old Samsung Galaxy stopped working as in, calls were garbled &/Bought a Samsung SIII took it home, calls are garbled or dropped. Returned cel & sim card replaced, cel reformatted, still can't use cel in & around home. Exchanged SIII, took it home, still calls garbled &/or dropped. This is the only cel in the house. Visitors can use their cheap track cels here. Was their a change to the tower that made my 2 yr old Samsung stop working w/calls & also does not allow my brand new SIII to work?