I'm on a jailbroken 1.1.3 iphone w/ ATT. I want to cancel ATT and use it on T-Mobile... Can I just install Anysim (or use some other software method) and that's it? Or do I have to do the whole downgrading process over again? Also, would I to "fake activate" it now since I won't be on ATT anymore? (My phone is 1.0.2 OTB) Thanks!