mouse input to touch input help please

 #pragma strict
  
 var prefab : Transform;
 var dist : float = 10.0;
 var curr : Transform;
  
 function Update() {
     if (Input.GetMouseButtonDown(0)) {
        var pos = Input.mousePosition;
        pos.z = dist;
        pos = Camera.main.ScreenToWorldPoint(pos);
        curr = Instantiate(prefab, pos, Quaternion.identity);
     }
     if (Input.GetMouseButton(0)) {
        pos = Input.mousePosition;
        pos.z = dist;
        curr.position = Camera.main.ScreenToWorldPoint(pos);
     }
 }

hello, i am trying to convert this code to touch input, however when i test on a mobile device, nothing happens with the swipe. i've tried the following :

 var prefab : Transform;
 var dist : float = 10.0;
 var curr : Transform;
  
  function Update() {
     if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Began) {
        var pos : Vector3 = Input.GetTouch(0).position;
        pos.z = dist;
        pos = Camera.main.ScreenToWorldPoint(pos);
        curr = Instantiate(prefab, pos, Quaternion.identity);
     }
     if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Moved) {
        pos = pos;
        pos.z = dist;
        curr.position = Camera.main.ScreenToWorldPoint(pos);
     }
 }

also i have the following script on the prefab which should be spawned:

 var speed : float = 0.1;
 var trail : GameObject;
 
 
 function Update () {
     if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Ended) {
         Destroy(trail);
         }
         if (Input.touchCount > 0 && 
           Input.GetTouch(0).phase == TouchPhase.Moved) {
 
             var touchposition:Vector2 = Input.GetTouch(0).position;
 
             transform.Translate (touchposition.x * speed, 
                         touchposition.y * speed, 0);
         }
     }

i have tried tweaking the code a bit, but nothing seems to work. :( please assist?