Our fingerprint is one of the most secure ways to unlock your phone without entering a password. It’s quick because you only need to touch the device, and no one can use it unless their fingerprint is also registered. They’ve been standard in our smartphones for several years, and aside from a few hardware manufacturers experimenting with other biometric methods now and then, it’s by far the most popular. However, it is not completely bulletproof. And, if a hacker really wants to get into your phone, he or she can now brute-force the fingerprint scanner as if it were a password. They only need $15 in equipment and a little elbow grease.