Here’s my business card.
Perhaps we should exchange business cards./Do you have a business card (on you)?
It’s (all) written on my business card./ I have a business card with me (somewhere).
Let me just get my business cards./ Just a moment while I find my business cards.
My mobile number is written here./Commenting on business cards/Ah, so your office is in…
… department? Does that mean you work with…?
Sorry, how do you say your family name/ middle name/ company name/ street name?
Do you have an extension number?