Have a Motorola phone? Want to make it more secure? This secret PIN Scramble feature lets you do precisely that.

On an Android phone, you can set a SIM PIN, using the Settings menu. Tap the Settings app on your home screen, then tap to go to the "Security" or "Fingerprints and Security" submenu.

Most people use predictable PINs that thieves try first. Find out which codes to avoid and what you should use to better protect your phone.

If you have an Apple or an Android phone—and you probably do—you have the option of locking your phone using a PIN code. With most of these phones, you can choose a four-digit PIN or a six ...