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It could be so they can link your phone conversations (likely recorded by your provider) to your emails / social accounts, to make the surveillance picture more complete.

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They claim 2-factor authentication enhances security, but I keep hearing from security experts that it actually makes you more hackable.

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this, I avoid giving my phone # whenever possible, but it's getting to be impossible.

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so, one leak and every hacker in the world has my phone #. They're also going to have my DoB, addresss, etc... and they can get my phone # switched thru CSR to a phone of their choice. Then they own everything. It's insanely stupid.

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funny, really, this stuff didn't use to matter. Unless you had a sensitive job, you'd get the phone book to put your phone # and address in it, so people could find you.

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Norway still works this way; in fact, having your number in the phone book is extremely difficult to opt out of, and it can be found online. Nasty implications, but classic example of Norwegian naivety.

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yeah, it was hard to opt out, but not impossible. IIRC you had to pay to have an unlisted number. Could work amusingly though. Construction work near a friend's house all night so she would call the company boss every hour, wake him up.