If you work with your hands, you may have noticed that the fingerprint reader can be somewhat unreliable, requiring several jabs from the meat nugget to work. It only takes an additional second or so, but it's a speed bump when it comes to unlocking.

The problem is that fingerprints wear out and change as you work with your hands. It's not enough of a change to allow you to get away with crimes, but the wear and tear and scuffs and scars can be enough to fool the scanner. //

#1: Give Android the middle finger

Rather than using the tips of the fingers, use the sides, especially the thumb. Again, it's a spot that takes less damage.

Another trick I find works well is to enroll the same finger with the fingerprint reader several times over a period of time. This way, it learns to read your fingerprint through the random scuffs and scars over a period of time.