[jyl]

I notice that some services use your phone number as the account identifier.

For example, I just signed up for Zelle (money transfer) via my bank - gave my phone number and that was it (I was logged into my bank account, so I guess they know its my account). I also signed up for WhatsApp and my phone number is my userid.

So . . . what happens if I give up this phone number and it is re-issued to someone else? What potential for confusion and mischief is there?