G Calibration

[jonlee83]

Hey guys,
Im wondering if this is a issue. because of the camera on the back of the phone, i believe g-calibration doesnt calibrate correctly. The phone is not flat on the surface. I say this because when i play games like racing or hungry shark (i think thats what its called) when i hold the phone parallel to the ground, it turn left or right ( dont remember which direction). I there a way to calibrate it correctly?