I need help making this script work for android touchscreen

I am trying to develop a JavaScript that will allow me to rotate the character in z axis by swiping left and right on my android device. Here is what I have But it only works on pc.

 // Smoothly tilts a transform towards a target rotation.
 var smooth = 2.0;
 var tiltAngle = 30.0;
 function Update () {
 var tiltAroundZ = Input.GetAxis("Horizontal") * tiltAngle;
 var tiltAroundX = Input.GetAxis("Vertical") * tiltAngle;
 var target = Quaternion.Euler (tiltAroundX, 0, tiltAroundZ);
 // Dampen towards the target rotation
 transform.rotation = Quaternion.Slerp(transform.rotation, target,Time.deltaTime * smooth);; }

Thanks