Unfortunately, without losing your data, your phone cannot be unlocked. Therefore, to unlock your phone you will need to reset your factory. For this task, shout down your phone. After 10 seconds press and keep the up and down volume buttons, the power button and the home button. After the Android logo will appear on your phone screen, press the home button to enter the menu. Select from the menu Wipe data/Factory Reset. Wait a few moments and reboot your phone.