I bought a iPhone 4 and now I want to give my older 3GS to my friend to use in Germany. I just used jailbreakme.com and it worked well. I am not familiar with how this process works though. Can my friend now take the phone to a T-Mobile store in Germany and set up service (it had been set up on AT&T)? Is there anything else that needs to be done? Also, can she use the same SIM card? Also, I want to reset it to delete the data (I think I use the option to reset all content and settings). Will resetting remove the jailbreak and she will have to repeat that again? Thanks a lot.