Available variables for updating contacts - which do you know?

Background: I try to setup some SMS related stuff. I create contacts with SMS numbers, but they have no email. Thus appear as anonymous, which they aren’t.

I know I can use today as a variable for day fields. What other variables are you aware of? Wonder if there is a way to reference other fiels, so I could for instance write {mobile}@domain.com as a placeholder into the email field via the campaign.

Are you aware of variables, that may be useful to generate something unique in this case?