[standan]

Yes. For known products we provide manufacturer support phone numbers, hence ability to make a call from the app. For adding recipts we need file system/camera access. If you would like to connect with friends to share reviews/recommendations then contacts. Hence the long list...

[luhn]

Best practice is to ask for those permissions as they come up, rather than asking a user to trust your app with the world up front. https://developer.android.com/training/permissions/requestin...