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2FA is using your password and your phone (for example) to get into an account.
If someone has your phone and your biometrics/password you're basically screwed.
It seems like a really unlikely sequence of events that would lead to this.
Do you have any sources talking about this happening?
OP is correct 2FA refers to authentication via 2 factors, e.g. digital and pin. Phones use only one, you can unblock them with either a digital or a password, that's LESS secure than 1FA and much less secure than 2FA.
The phone itself is not a factor, because every scenario starts with the attacker having access to the phone. If phones had 2FA someone would need to get your digital AND your password to access it, so a lot less likely to happen than having either of them.
The answer as to why that's not an option is this would be impractical and people wouldn't use it. But it would be definitely more secure than current system.