I do this very think all the time with my preferred carrier (Canadian), and they don't bat an eye. I'd think it so common that they would experience it every day.

However, sometimes when I give other airlines the number, I get the response "Sir, I need a number where we can reach you in (destination city)." I then have to explain my cel phone (haven't they been around since the 80's?), to which they say "Oh, OK."

Regards,

Ken Hamer