One person/cell phone to manage multiple accounts

One person/cell phone to manage multiple accounts

Hi.
I have a personal Free account to keep my own domain/emails. Now I need to create a Business account to my company's own domain, but I have only one mobile phone number I use to everything.

How do I do to manage this?

Can I manage a Free domain and a Business domain under the same account?
Or, there is some hidden way to create multiple accounts with the same phone number?
Or, there is no way to sign up to the Business account I need just because I already have a Free account?