Changing SIM card, you can be tracked by cellphone used.Location can be narrowed down using IMEI triangulation of cell towers the cellphone is closest to.
The closer this number is to 0, the stronger the cell signal (or the closer you are to a tower).
The Field Test entries under categories on this page are: "Neighboring Cells" you can see how many cell towers or relays are visible to your i Phone while using GSM (2G).
tel://NUMBER will pop up a dialog asking if you wish to make a cellphone call to NUMBER using the baseband.
facetime://CONTACT will pop up a dialog asking if you wish to make a video call to CONTACT using Apple's Facetime over Wi-Fi.
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It is a unique identification number for every cellphone (including the i Phone).
Many cell networks can ban stolen cellphones using this IMEI number (changing SIM cards have no effect on ban) by checking the EIR (Equipment Identity Register) database downloaded from a central server.
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