Guys, there are dozen of thread on cell phones and security already. If you know your device is capable of GO tracking, the most logical thing to do is turn it off, or if you stillness insecure, don't use a smartphone at all. If you are that paranoid, why are you on this site at all? I don't mean it on a mean way, but of you really think your little grows are of interest to the Feds, just don't do it.
Personally, I use my phone for just about everything. My iPhone is. Fabulous tool for work, school, recreation and travel. Only last week I had to look up the fastest bus and train route in an unfamiliar area on the fly to get Tip Top to the bus station on time. I use it for writing notes and essays, reading guitar tabs,video, social networking, maps, bookings, checking email form my tutors when I don't have access to a computer etc. A smartphone is a powerful tool. You just need to know how best to use it and not let others use it to get to you. I mean people were freakingbout about WiFi when it first came out but it's down to you to not be using an unsecured network