Switch between Cameras on Android.

Please use code tags to surround your code, as mentioned in Using code tags properly

It makes it far easier for other programmers to read, and use your code snippet.

I would do:

if (Input.touchCount > 0)
        {
           // do something on touch
camSwitch = !camSwitch;
FirstPersonCam.gameObject.SetActive(camSwitch);
ThirdPersonCam.gameObject.SetActive(!camSwitch);
        }

But if you require better touch handling, something like: Simple swipe and tap mobile input