Unfortunately, if you don't remember the pattern used to lock the mobile, you will need to factory reset the device. To do this, you will need to check its user manual, but basically, you need to turn it off and to press and hold simultaneously the Volume Up and Down, Green button (Send), and Center button (OK). After that, press the Red key (Power on/End call button) until the Motorola logo appears. Check the official web page for further details.