Black Screen on Android Device after AddMob Plugin

The game in question worked just fine up until the point i tried to add the AddMob plugin.

I flowed this tutorial: https://developers.google.com/mobile-ads-sdk/docs/games#admob_mediation_support

I downloaded the package created an add and tried to build it on my phone (Samsung Captivate Glide SGH- i927) The build itself went fine but when the game starts the phone gets a black screen with the status bar and stays like that no matter how long I leave it.

The same thing happens every other time I start the game manually.

My initial thought was that the package was somehow corrupt so I went back to a backup that i made before i installed the package but the problem did not go away.

The only thing that was odd with the initial build was that it asked for an android SDK update and I let it.

I tried the following:

1. Factory Reset on the phone

2. new ROM

3. Reinstalled Unity

4. Fresh new Android SDK

5. Older SDK

6. Changed the setting in Player/ Other Settings

7. Building an empty project

After building an empty project i realized that no matter what i try to build on this device i get the same thing. Then i tried one more device and it build everything just fine.

I'm not sure if this is just on this one device but were there is one there is bound to be more. I will get a few more phones today and try to test it one them but if anyone has any idea what might be causing this I'll be more than glad to hear it.

Thanks!