Hi, I have an iPod touch 2G which is an MB model and currently runs on 3.1.2. I have recently bought an iPhone 3GS, which if I remember correctly, the salesperson upgraded to 3.1.3 and is an MC model. I am aware that so far it is not possible to downgrade my iPhone to 3.1.2 without losing any functional abilities, but I know that there is a Saurik SHSH solution to downgrading. I'm just wondering, if I have Cydia on my iPod touch, is it possible to use it to jailbreak my iPhone? Thanks in advance.