Changing view based on device

Hi Unitarians!

I've got a pretty classic problem for app makers, but its not often seen by game developers. My issue is to detect and respond to if the user is using a tablet or a phone for their Android device. If they have a phone, I want them to see my app in portrait mode. If they have a tablet, I want them to see a landscape mode. I want it locked in either landscape or portrait depending on their device.

I have seen ideas so far. First would be to let the user choose their own orientation through auto rotation, and I would display my view depending on what they have. My problem is that I want my landscape view ONLY for tablets and my portrait view ONLY for phones. My users can't choose.

My second solution is this script: using UnityEngine; using System.Collections;

 public class NaturalOrientation : MonoBehaviour {
     
     public static int ORIENTATION_UNDEFINED = 0x00000000;
     public static int ORIENTATION_PORTRAIT = 0x00000001;
     public static int ORIENTATION_LANDSCAPE = 0x00000002;
     
     public static int ROTATION_0     = 0x00000000;
     public static int ROTATION_180     = 0x00000002;
     public static int ROTATION_270     = 0x00000003;
     public static int ROTATION_90     = 0x00000001;
     
     public static int PORTRAIT = 0;
     public static int PORTRAIT_UPSIDEDOWN = 1;
     public static int LANDSCAPE = 2;
     public static int LANDSCAPE_LEFT = 3;
     
 #if UNITY_ANDROID
 
         AndroidJavaObject mConfig;
     AndroidJavaObject mWindowManager;
     
     //adapted from http://stackoverflow.com/questions/4553650/how-to-check-device-natural-default-orientation-on-android-i-e-get-landscape/4555528#4555528
     public int GetDeviceDefaultOrientation()
     {
         if ((mWindowManager == null) || (mConfig == null))
         {
             using (AndroidJavaObject activity = new AndroidJavaClass("com.unity3d.player.UnityPlayer").
                             GetStatic<AndroidJavaObject>("currentActivity"))
             {
                 mWindowManager = activity.Call<AndroidJavaObject>("getSystemService","window");
                 mConfig = activity.Call<AndroidJavaObject>("getResources").Call<AndroidJavaObject>("getConfiguration");
             }
         }
         
         int lRotation = mWindowManager.Call<AndroidJavaObject>("getDefaultDisplay").Call<int>("getRotation");
         int dOrientation = mConfig.Get<int>("orientation");
 
         if( (((lRotation == ROTATION_0) || (lRotation == ROTATION_180)) && (dOrientation == ORIENTATION_LANDSCAPE)) ||
         (((lRotation == ROTATION_90) || (lRotation == ROTATION_270)) && (dOrientation == ORIENTATION_PORTRAIT))) {
               return(LANDSCAPE); //TABLET
           }     
           return (PORTRAIT); //PHONE
     } 
 #endif

Essentially the script detects if the user is using a tablet or a phone through their "natural orientation", which is conveniently landscape for tablet and portrait for phone. A comment on the page where I got the code from however, says "I've seen getRotation() and orientation go out of sync sometimes, so this isn't a perfect solution." This means that this isn't a solution either.

So, how would I detect if my user is using a tablet or phone, and how would I be able to change my UI based on that?

Thanks!