Mobile log-in: how to divide two types of user logins and two methods of logging in?

So I'm designing a modile/table log in page. There are two types of users who can log in because the functionalities of the application depend on what type of user they are. Employees and managers.

Also, there are two methods a user can log-in. They can login with the classic user name and password and also login with JUST their phone number (no password required).

What is the most seamless way to organize this for mobile? The simpler the better, since the user persona is one who is not tech-savvy.