So I was just thinking about this and now, I'm not really sure what to do. I have my 4s preordered and it should be coming in in about 2 weeks so in the meantime, I have my 3gs. My friend who has t-mobile wants it so the question is. Will I still be able to jailbreak the 3gs on iOS5 once someone figures it out or will my 3gs be useless once I activate the 4s? Will the old sim that's in my 3gs be enough to turn the iPhone on and allow me to jailbreak it or should I just stay on 4.x and not take the chance? BTW, my 3gs is already jailbroken from jailbreakme.com.