Hi, recently I have gone through 3 phones, all working normally but it was thought that my sim card was so old that it was shorting out the batteries so the phones would act up and not charge. So I got a brand new factory unlocked Samsung S II AT&T phone and I went to my service provider and got a brand new sim card with the same phone number. The phone worked great for a day. Then it died and refused to charge. The charging symbol would pop up occasionally for a second or two then disappear until I wiggled the cord around. I used the new phone charger that came with the phone as well as a friend's charger that always works with her phone (it's compatible with mine). I even went somewhere else and used another person's charger but still nothing. I need help, I paid a lot of money for this new phone and I'm sick of being without one. Any suggestions on what it could be would be very much appreciated. Thanks guys!