"To be honest I think the box achieves the goal. I do not expect FxOS to be complete. I expect it to have room for improvement and to be welcoming of my contributions. That is what FxOS needs right now, the luxury boxes can come later."
Amen. Well-written, and I hope you enjoy your new FxOS :)
* You probably want to use a mobile network (like GSM) for phone calls and data. As long as you're booked into the network, the carrier knows (approximately) where you are.
* If you use Wifi, you can be tracked by your MAC address
To just reduce the amount of tracking by companies (not governments) a little bit, it would help to use distributed services like XMPP instead of Whatsapp and Facebook. Then you could choose service providers that you trust, or host your own server, and still have interoperability with other people. Because businesses like lock-in, this will probably not happen for the majority of people.
There is a startup that does exactly this - track MAC addresses of cell phones in stores, and then resell that data to store owners, so they can track who comes into their stores: http://www.getnomi.com/