I have a iphone4 which is on another network, a fd of fd sold it to me. (now i regret it, i would pay the extra to for a factory unlock). So he unlocked the phone with me, it has a 4.0.1 OS with baseband 1.59.00. I would like to upgrade to 4.1 since i cant facetime with my fds, but i do not have the original SIM card to activiate the phone. So just wonder if i upgrade the phone using tinyumberalla, during the process do i need a oriiginal SIM from the original locked network in order to restart after restore 4.1? I don't want to rush through and end up lock out from the phone, so please help. thanks.