Its a principle, a phone is not a form of identity, its a contact method. It is prone to being stolen, lost, misused, reassigned, changed and is a victim of no signal. There are a plethora of other more secure means of verifying identity. I for one use a YubiKey and my laptop also have a fingerprint reader and my surface pro has windows hello. Various companies i use also accept 1 of these forms of 2fa, including banks, skrill, gumtree, payee, governments, stripe. Yet paypal wants only a mobile number.
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