To reset a password on a Samsung phone, restore the phone to its original factory settings, and reprogram it. Locate the Reset Phone option in the Security sub-menu of a Samsung phone.
In order to reset a password on a Samsung phone, the entire phone must be restored to its default factory settings. This resetting process does not delete any personal data on the phone such as contacts and messages. Rather, it restores the default ring tone, keypad tones and display settings on the phone and enables the user to reset the password to one of his choosing.
To reset a Samsung phone back to its original settings, press Menu, then Settings, then Phone Settings. Locate the sub-menu Security under the Phone Settings tab. When prompted to enter the phone's four-digit lock code, enter the last four digits of the phone's number. Choose Reset Phone, and press the left Yes key, then wait as the phone goes through a power-cycling process. Once it is finished, type in the code *228, then press the space bar button on the standby screen to reprogram the password.
Those with Samsung Galaxy S6 phones also have the option of using Android Device Manager or the company's Find My Mobile feature to reset a password. These options allow the user to create a temporary password to get into the phone for the purpose of creating a new password.