Hi, I try to upgrade my iphone 3GS version 4.1 to become 6.1, I download the itunes then now why its cannot continue updating my iphone? always says that we are sorry, we are unable to continue activation of this time. Please try again later or contact customer care. Please help me for this problem.
Most likely, your phone was hacked to carrier unlock. When you updated, the hack was removed and the phone is now re-locked to its original carrier. It will now activate and operate only with that carrier, using their SIM card