i jailbroke the fixed version of the 3gs a month or 2 ago. all seemed fine, but if you turn it off or download from cydia, it gets stuck on the apple logo on reboot. used boot tethered for that, but still have those problems. secondly, in the last couple of days the iphone has stopped allowing me to send texts or ring anyone, it just says call failed immediately. tried a different sim but this time it doesnt have any signal aswell, and doesnt always show the network. someone please help !!!