I'm developing a game for Android devices and I have a script that solves the aspect-ratio problem for computer screens but not for my intended target platform. It looks perfect on computer, even when re-sizing the game screen, but not when running my game in landscape mode on mobile phones.

This is my script

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class reso : MonoBehaviour
{
    void Update()
    {
        // set the desired aspect ratio (the values in this example are
        // hard-coded for 16:9, but you could make them into public
        // variables instead so you can set them at design time)
        float targetaspect = 16.0f / 9.0f;

        // determine the game window's current aspect ratio
        float windowaspect = (float)Screen.width / (float)Screen.height;

        // current viewport height should be scaled by this amount
        float scaleheight = windowaspect / targetaspect;

        // obtain camera component so we can modify its viewport
        Camera camera = GetComponent<Camera>();

        // if scaled height is less than current height, add letterbox
        if (scaleheight < 1.0f && Screen.width <= 490 )
        {
            Rect rect = camera.rect;
            rect.width = 1.0f;
            rect.height = scaleheight;
            rect.x = 0;
            rect.y = (1.0f - scaleheight) / 2.0f;

            camera.rect = rect;
        }
        else // add pillarbox
        {
            float scalewidth = 1.0f / scaleheight;

            Rect rect = camera.rect;

            rect.width = scalewidth;
            rect.height = 1.0f;
            rect.x = (1.0f - scalewidth) / 2.0f;
            rect.y = 0;

            camera.rect = rect;
        }
    }
}

I figured that my problem occurs in this part of the script:

if (scaleheight < 1.0f)
        {
            Rect rect = camera.rect;
            rect.width = 1.0f;
            rect.height = scaleheight;
            rect.x = 0;
            rect.y = (1.0f - scaleheight) / 2.0f;

            camera.rect = rect;
        }

Its look like this on my mobile phone (portrait):

and on landscape mode: