I recommend you use plugin **[Device Console][1]**.
It gives us a debug console on devices. Very easy to see logs.
Details: https://www.assetstore.unity3d.com/en/#!/content/44935
Screenshot:
![alt text][2]
[1]: https://www.assetstore.unity3d.com/#!/content/44935
[2]: http://www.tiinoo.com/images/device-console/plugin-description.png
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