Unity and "call information" permission

Hello, we’ve published our app on Play Store and we’ve noticed that it’s automatically added a permission

“This app has access to:
Device ID & call information
Allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call

which may prevent some people from installing it. Is there any way to change it? Or can we find exactly which plugin is causing it? Is there a possibility that it has anything to do with using AdMob?

Remove any call to SystemInfo.deviceUniqueIdentifier, and it should not be automatically added.
http://forum.unity3d.com/threads/internet-and-read_phone_state-permissions.163892/