One sees small bits of information every now pop into HN about how they might not be as anonymous as expected, to put it mildly, but it would be nice to have an

One sees small bits of information every now pop into HN about how they might not be as anonymous as expected, to put it mildly, but it would be nice to have an overview of how trackable your vanilla smartphone is or isn't. My intuition right now is that they're pseudonymous at best, and that the average user is very quick to provide credentials that would associate the pseudonym to their actual names and other personal info. Can anyone provide an assessment (or better yet, a link to one) on just how anonymous those anonymous devices are? (@saddino: this response is not directed at you partly because I'm not sure whether you're being technical or sarcastic — or both.)