I still use an old phone without any extra applications. I use it for making calls, sending SMS, and writing short personal memos and storing important passwords. That's about it really. I now want to upgrade to a modern Android phone, and feel the mobile world has changed a lot the last years. The main thing being the importance and attraction of apps. In the "good old days" all the "apps" you needed was on the phone straight from the manufacturer and you did not need to install anything more. But today I get the impression that more and more functionality is outsourced to 3rd party apps. Which leads me to my question. Before I just had to trust the phone manufacturer (e.g. Nokia or Siemens), but now it seems I have to trust all kinds of 3rd party backyard software programmers - which I certainly don't. When I write my HIGHLY personal memos and passwords in a note taking application on my phone it is EXTREMELY important for me that they stay on the phone and does not leak out to anyone else. So, to my question: Given that I have the privacy of my own personal data (notes, passwords, photos, etc) as the single most important priority, should I consider buying an Android phone or not? I really would like an Android to but I am unsure if the paradigm underlaying the very fabric of Android is contrary to my requirements. Must I start thinking about my phone as I think about Facebook. That everything I put on it could one day become public without my control, even though the settings today are set to "private"? If I were to go for an Android phone, what would be the rules of thumb I would need to adopt to ensure my personal data stay personal and private? I am especially thinking about installing apps from the Android Market. Must I rule out all apps that require network access (which seems to be the vast majority)? What other rules of thumb would ensure the privacy of my data? Are there specific manufacturer or phone models that are more geared towards this kind of security than others? PS. And for curiosity - how to you people think about the data on your phone? Do you accept that it may end up somewhere else? Or are you confident it will not and if so why are you so confident about that?