Not convinced about this iOS study
I can't find any source for this study, but this one seems similar: https://www.appthority.com/appreport.pdf
Certainly that study also uses the 96% figure, but this time it claims that they "share data with advertising networks and/or analytics companies", which could just mean anonymised data about the usage of the app. Not ideal, perhaps, but that's quite different from sharing location and contacts information.
What these studies fail to do, however, is take account of the fundamentally different approach to permissioning between iOS and Android - iOS allows you to install an app but then deny permission later, so it's quite possible that most users simply deny the permission - this would skew the results quite significantly. I've used plenty of apps which function quite happily if denied access to optional services such as contacts lists.
This article discusses this issue in more detail: http://www.theguardian.com/technology/2013/dec/20/android-apps-permission-app-ops