Anyone with a Samsung Tocco Lite?

Today at work I had my phone in my jacket pocket, not realising it wasn't locked. Next thing I feel my phone vibrating (as it was on silent mode) so I take the phone out my pocket and look to see that I'm calling emergency services 999!! This is a touch screen phone, I doubt that I managed to press keypad, then dial 999 and then press call, all from having it in my pocket? Does anyone else have this phone that knows of any way this could have happened? It would be good to know!