What to Do When Forgot PIN, Pattern or Password on Android
 

Android normally secures your device by demanding a PIN, pattern, or full password. Your phone isn’t useless if you forget the unlock code. Luckily, this video can help you bypass the pattern, fingerprints, PIN and password without data loss.

http://goo.gl/XafCEn

This method only works with Samsung Galaxy devices:
Samsung Galaxy Note3, Note4, Note Edge, Note5, Note5 Duos, Note8, Note II;
Samsung Galaxy S3, S4, S4 Active, S4 LET-A, S4 Mini, S5, S5 Duos;
Samsung Galaxy Tab 2 (7), Tab Pro (10.1), Tab Pro (8.4), Tab S (8.4), Tab2 (10.1)