Accelerometer

I’m doing simple plane simulation on android, but i have one problem, when i’m using unity remote, only position i can play on my phone is lying. How to set accelerometer’s starting position or how to calibrate accelerometer? I’ve checked some posts about it but no one helped.
here is my actual rotating code:
transform.Rotate(Input.acceleration.y * 2, 0.0f, -Input.acceleration.x * 2, Space.Self);

Any ideas? I’m looking for it for 5 day ;_;