If you're using Android, I'd highly recommend using a combination of XPrivacy [1] and Android Firewall [2] (iptables frontend).
To make your life easier, disallow everything from accessing the net in Android Firewall. Then, for those apps which you've allowed net access, further tweak what they're allowed to access in XPrivacy. As a rule, turn off account info, clipboard, location, contacts, and storage.
If you're using Android, I'd highly recommend using a combination of XPrivacy [1] and Android Firewall [2] (iptables frontend).
To make your life easier, disallow everything from accessing the net in Android Firewall. Then, for those apps which you've allowed net access, further tweak what they're allowed to access in XPrivacy. As a rule, turn off account info, clipboard, location, contacts, and storage.
Not perfect, but a decent solution.
[1] https://github.com/M66B/XPrivacy
[2] https://play.google.com/store/apps/details?id=com.jtschohl.a...