hi all brother i'm Ferdinand yeap from malaysia. i just bought a Iphone 8GB from America. after i get it , i plug in the USB cable it automatically call me to download the software for Iphone to solve and upgrade the firmware, after i upgrade i was canot get any network at Malaysia, It show the Sim card inserted can not be supported. How can i solve the problem.? now just can call for emergency call only. Thanks for help .