This completely misses the point of Two-factor authentication, though.
Two-factor authentication is all about increasing security by combining two separate factors: something you know (password), and something you have (phone). From what I can tell, you're just switching from relying on one factor (password) to relying on the other factor (phone). It's just a different one-factor authentication paradigm.
Unfortunately, this leaves several gaps. For example, what happens when I lose my phone, or someone takes it from me? Can that other person log in immediately?
I can potentially understand an argument that this is more secure than solely password-based solutions (although I don't think it would be for me, where I use complex random passwords), but I certainly wouldn't consider it an alternative to two-factor authentication.
Two-factor authentication is all about increasing security by combining two separate factors: something you know (password), and something you have (phone). From what I can tell, you're just switching from relying on one factor (password) to relying on the other factor (phone). It's just a different one-factor authentication paradigm.
Unfortunately, this leaves several gaps. For example, what happens when I lose my phone, or someone takes it from me? Can that other person log in immediately?
I can potentially understand an argument that this is more secure than solely password-based solutions (although I don't think it would be for me, where I use complex random passwords), but I certainly wouldn't consider it an alternative to two-factor authentication.