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Life Without a SIM Card
(blog.thenewoil.org)
Welcome! This is a community for all those who are interested in protecting their privacy.
PS: Don't be a smartass and try to game the system, we'll know if you're breaking the rules when we see it!
Some of these are only vaguely related, but great communities.
Android phones automatically randomize Mac addresses.
Although, if you are on Google's Android, it is possible for Google to keep a list of all Mac addressed used and then work with the hotspot owner to find out your whereabouts.