I recently upgraded one of my iphone 4s to a 32gb leaving me with a spare 16gb which I plan to sell. This one is an unjailbroken phone with 4.0.1. I'd like to wipe all of the data off of it, jail break it, and unlock it to sell it. I'm assuming the best way to go is to run Tiny Umbrella to restore to 4.1 keeping the base band intact and using limera1n + ultrasn0w to jailbreak + unlock? Also is there any way of checking to see if the unlock worked if I have no other SIM cards to try from myself or friends? Thanks!