Privacy advocates got access to Locate X, a phone tracking tool which multiple U.S. agencies have bought access to, and showed me and other journalists exactly what it was capable of. Tracking a phone from one state to another to an abortion clinic. Multiple places of worship. A school. Following a likely juror to a residence. And all of this tracking is possible without a warrant, and instead just a few clicks of a mouse.
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The IMEI can’t be changed. That’s the serial number of the cellular modem
Edit: reviewing the link you shared in another comment that looks plausible. Just be warned good luck on any kind of warranty or insurance claims if you change IMEIs. I used to work for a cell phone manufacturer and we used the IMEI to both identify roughly when the device was purchased to make determining warranty status dead simple, and to identify devices as they went through the repair process.
Additionally carriers will often blacklist IMEIs for activation (usually on devices which were financed but never paid off) so that’s another potential opportunity for trouble
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