when i am being rung my phone flashes like the screen goes black and then back again and sometimes for the whole time im being rung it stays black and just rings and even if i keep tapping the screen/unlock button it won't work you can just hear it ringing, anyone get this or anything i can do? and also im going to spain tomorow and im going to take my phone for the music so is there any way i can turn off all messages/calls so it deffintley wont charge my contract? thanks