You can't unlock the screen if you forget the screen lock password of Samsung mobile phone. We suggest you try the following methods: 1. If the pattern/signature/fingerprint unlocking mode is set, you can use the set PIN code when drawing the pattern/signature or entering the fingerprint to unlock. 1) pattern/signature unlocking: When an incorrect unlocking pattern/signature is entered for many times (usually five times), you will be prompted "Backup PIN" in the lower right corner of the screen. Enter the previously set PIN password, and then click OK. 2) Fingerprint unlocking: When the fingerprint cannot be unlocked, you will be prompted "Backup PIN" at the bottom of the screen, enter the previously set PIN password, and click OK. 2. If your mobile phone supports Samsung Dive remote control function and meets the following conditions: remote control and mobile data (or WLAN) are turned on; The mobile phone has been bound with a Samsung account. Log in to Samsung official website-Apply-Find my mobile phone. After logging in with a Samsung account, click Unlock My Device. After this operation, the previously set screen locking mode will directly become the default sliding unlocking mode, and then the mobile phone will be unlocked by sliding. If the above operation fails or the "Unlock My Device" function cannot be used because it does not meet the requirements of the remote control function, please send the machine to Samsung Service Center, and the after-sales engineer will help you unlock it safely.