I suggest using XMPP/Jabber instead of Whatsapp or Facebook. There are some free clients for android. XMPP is open and decentral, what do you want more? Also, Google and Privacy are no friends. So better do without it, there is a thread where I and many others recommend lots of free alternatives which are too cool to collect your data.
If you need Hardcore privacy you can disguise yourself with the tor network using the apps of the guardian project.
Have a nice day!
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