UnityInput.cs

// unity pc and mobile input
// http://docs.unity3d.com/ScriptReference/Input.GetMouseButtonDown.html
// http://docs.unity3d.com/Manual/MobileInput.html

void Update() {
    if (SystemInfo.deviceType == DeviceType.Desktop) {
        if (Input.GetMouseButtonDown(0)) {// 0 - left click, 1 - right click, 2 - middle click
            // click
        }

    } else {
      for (var touch : Touch in Input.touches) {
          if (touch.phase == TouchPhase.Began) {
            // tap
          }
      }
    }
}