It has been figured out that if you connect your phone to a computer, you can keep doing a brute force password attack to unlock it and usually takes about a day to open it. This is with a four digit passcode. With a 6 digit passcode, it is much harder to crack.
The Supreme Court recently ruled that law enforcement cannot get cell phone data location without a warrant. Not to say that Uncle Sam is not still watching us. You know he is.