I am fairly new to iphone and have been playing w/ j/b. I have 4.2.6. Used jailbreakme to j/b phone. No probs but saw there are updates available on itunes for my phone. should i upgrade? And what will happen to my j/b if i do. Phone is slow at times (same as before i j/b) and wondered if new software would cure.. Or maybe its just my connection. Havnt downloaded anything from cydia & have no songs, etc on device to slow it down. And i close my apps.. Any advice would be helpful. Thanks!!