I recently ported my cell number. None of the services that use it for auth seem to care, but within hours I got a text from CVS pharmacy saying "A recent change in your mobile service requires you to reply YES to continue receiving text alerts". I'm curious how that works.
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Probably the answer is to just not use SMS for 2FA, but could a company like coinbase use the feed to eg apply extra security after your phone number has been ported?
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That is what their marketing suggests is the intended use of that product.
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