Hi im using iPhone4, i have a few questions, a) how to tell whether d iphone has already been jailbroken or not, (b) after jailbreaking d iphone4, can this iphone4 connect with other bluetooth devices such as fm nokia, motorola etc or do i still need to install some programs. (c) after undoing jailbreaking, will apple know that i have jailbreak d iphone previously. Thanks'