Use the real gravity to move with object !?

Hi guys,

So I need to add force to object with real gravity on Andriod.
I tried this but var gravity is always 0,0,0.

#pragma strict
var gravity: Vector3;
function Start () {

}

function Update () {

gravity = Input.gyro.gravity * Time.deltaTime;

rigidbody2D.AddForce(gravity);
}

btw I am using unity remote.

Yeah so correct answer was by Scribe. THANK U