In order to gain access to your phone, you will have to perform a factory reset. This can be accomplished by entering the Recovery menu. To access the menu, turn off the phone then press Volume UP + Home button + Power button. Hold these buttons pressed until the phone enters the Recovery menu then select Wipe Data/Factory reset and reboot it. You now have access to phone's functions. The apps, settings and any other items added will be removed because of this operation.