Even if you switch phone numbers, using Hemisphere they can determine your new number. They look for a new phone number calling all your old contacts.
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Absolutely. But allowing/encouraging people to keep a single identifier sure makes things easier, and cuts down on your database joins.
Do you really think the DBA for a project that doesn't official exist gets to write consumer protection policy?
Can you imagine any nontechnical organization doing something as complicated as passing a law just to cut down on database joins? Seriously?