ok to make a long story short about 2 months ago i bought me an 32gb 4s from one of those mom and pop cell phone retailers in a shopping mall everything was fine but then it started to act up, whenever i call some one the call will go thru on there end and ring, but on my end its total silence, if i hang up and call back then most of the time one time is all it takes then it will go thru. i checked on line and the serial # says the warrenty expires nov.29 2012, i could take it and let apple exchange it, BUT THEN I LOSE MY JAILBREAK what would you do?