[forum456]

Isn't what you describe already there right now, as in the transaction will be completed if you press the accept button on my phone banking app?

no.
now, you transfer any money, you will not receive any SMS  to approve the transfer of  your money.
someone can transfer any money once he has access to your internet account.

i can give you all my passwords and tokens to you to access my internet account.
when you try to transfer my money, i will receive sms to seek my approval to transfer the money.
i will reject your request and you cannot transfer my money at all.