Do you have a backup? Apple is very serious about security, at this point your only option is to restore your phone, you can do this by powering the device completely off, connecting the device to a computer with iTunes installed, while connecting the device hold the home button(bottom middle button) while the device powers on, hold the button until you see a USB cord that says connect to iTunes. From there you can restore your phone. Note that your backed up data will contain thepasscode so you may have to lose all your information to get rid of the passcode although your music and apps will automatically resync