http://zqktlw5bf6oycxq6qod452xnvdfcqhfwliz54bkul736g6b454jrk2ad.onion/wiki/index.php?title=Physical_Interaction
Note that this number is a property of the phone itself, and does NOT change if you pop out your SIM card to change carriers. As such, changing carriers with the same phone buys you no extra anonymity, and placing a SIM that is easily traceable to you into your anonymous pre-paid phone kills any anonymity you had, potentially even retroactively.
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