I want to jailbreak my iPhone 3gs running 3.0.1 I don't need to unlock it, but I heard push notifications get messed up and confused where they should be sent when you unlock. Does the same thug happen when you just jailbreak? Also, does the phone slow down or lag at all? Can I get mms working if I unlock? I'm not talking about an extra app or anything. I mean true mms through the standard SMS app. I know how to jailbreak, so I don't need help with that. There is a crazy amount of videos to show you how to do that. Thanks. Any help appreciated.