IMEI. This is the serial number of your connected device, whether an iPhone, Apple Watch, Android phone, or similar. It doesn't change.
IMSI. Serial number for the SIM card. A SIM card used to be a physical object (looks like a shrunken SD memory card). Now you can have either a SIM card or an eSIM, which is effectively a digital SIM card. In newer phones they can simultaneously support multiple SIMs such that you can 2+ phone numbers to your device.
MSISDN. Your 10-digit phone number in North America.
When you power up your cellular-enabled device and it goes hunting for a cell tower then it is going to be exchanging these types of identifiers.
Justice Harlan defines the privacy expectation in his concurrence in Katz, which is referenced in Kyllo, and states that a person must "have exhibited an actual (subjective) expectation of privacy and... that the expectation be one that society is prepared to recognize as 'reasonable.'" Thus, a person has a legitimate expectation of privacy if he honestly and genuinely believes the location under surveillance is private, and if a reasonable person in the same or similar circumstances would believe the location to be private as well. Therefore, the government has more latitude to legally survey communications in a public place than it does in a private place. Further, the courts have allowed the government to record conversations during jail visitations, provided that the surveillance reasonably relates to prison security.
These Antifa types are not too smart. "I'll wear a mask and bring my iPhone so I can take pictures, text and communicate, and even live stream!" Yeah, OK. Congratulations for putting a big, broadcasting beacon on your head...
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