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And you do realize your cellphone is constantly sharing your location with your cell phone company which is more than willing to give it to the government without a warrant.

Whatever you are doing is meaningless privacy theatre

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This makes sense to me but then why is CBP here needing/wanting to pay for ad data if they can just ask the ISPs/cell phone companies?
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They are probably actively providing that information. At AT&T we still are working very closely with the NSA.
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...and the phone itself broadcasts your position to the cell towers with remarkable accuracy, 24 hours a day.
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Hence the "realistically" qualifier.
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