There's only ten possible guesses, and most people use their thumb and/or index finger, leaving four much likelier guesses.
Also, IANAL, but I'm pretty sure that if law enforcement has a warrant to seize property from you, they're not obligated to do so immediately the instant they see you - they could have someone follow you and watch to see how you unlock your phone before seizing it.
Also, IANAL, but I'm pretty sure that if law enforcement has a warrant to seize property from you, they're not obligated to do so immediately the instant they see you - they could have someone follow you and watch to see how you unlock your phone before seizing it.