I have been back from Bali almost three weeks. While I was away I got a Bali sim card for my phone. Since I have been back my phone has jumped to line two about three/four times on its own. After the second time I spoke to Telstra who said my phone could have a computer problem and may need to have new software. This problem has only been since Bali. Has anyone else had this problem? My phone is 8months old.Can you get viruses through other sim cards?