Please note with new unity you can view device logs on editor console window, check the new attach menu in editor console window.
Using this tool you can easily check your editor console logs inside the game itself! All what you have to do is to make a circle gesture using your mouse (click and drag) or your finger (touch and drag) on the mobile screen to show all these logs!
You can download also from unity asset store https://www.assetstore.unity3d.com/en/#!/content/12047
To setup log viewer do the following