you dont crack passwords.
security systems are designed in such a way that a single individual cannot crack a password.
the CIA, or NSA or FBI can crack passwords because they can afford the equipment to do so. but then if u r up against the FBI, u wont be using a measly GTel phone and thats how it works. its the same for facebook, twitter etc.
For your gtel, the best u can do is reset the device thus losing all the data in the device. but before i tell you how to do that, isnt that GTel stolen?