Facebook could have your phone number and email address—even if you never handed them over to the social network. Everyone knows that Facebook collects vast amounts of data. But what many people might ...

Facebook almost certainly has your phone number and email address, even if you never handed them over. That's because any friend who shared their address book with Facebook also shared your details.

With a SIM-swapping attack, scammers hijack your phone number to gain access to apps on your phone—including banking apps.