How to make game fit all screen Size and Resolutions

Hello I have a simple 3d game for android. It works fine on the Galaxy Tablet and the Note II but when I test it on the Note 4 my formatting (Buttons) was all smaller and not in the correct location. I have a Camera Script that I thought would take care of it which is. My game is in landscape format. Any help would be appreciated.

 public class CameraScript : MonoBehaviour {
 
     //define here the original resolution 
     private float origW = 640f;
     private float origH = 320f;
 
     
     
     void Start(){    
 
 
         float scaleX = Screen.width / origW; //your scale x
         float scaleY = Screen.height / origH; 
 
         //Find all GUIText object on your scene
         GUIText[] texts =  FindObjectsOfType(typeof(GUIText)) as GUIText[]; 
         
         foreach(GUIText myText in texts) { //find element of text
             
             Vector2 pixOff = myText.pixelOffset;  pixel offset on screen
             int origSizeText = myText.fontSize;
             myText.pixelOffset = new Vector2(pixOff.x*scaleX, pixOff.y*scaleY); //new position
             float floatFontSize = origSizeText * scaleX; //new size font in a float
             myText.fontSize = (int)Mathf.RoundToInt(floatFontSize); // Closest value of fontSize
             
         }
     }
 }