Changing lock screens on your samsung galaxy note 4 is a good idea since there really is no security having the stock wipe option. To change the lock screen head over to the settings and there will be a few different ones to choose from. There is the pattern option that lets you set a pattern in any kind of combination to unlock your note 4. Then there is the pin option that is a pretty common lock theme. They also have the fingerprint scanner that works okay but can get kind of frustrating if its not reading your fingerprint correctly. Last but not least is the signature unlock that allows you to use s pen to unlock your phone with your signature. Whichever method you choose the galaxy note 4 has some nice lock screen themes.