.tel OK but promote it via a .com! - that is not the smartest.
Quite a few of the Thai girls/women in our estate office saw the video and at least half a dozen have bought them for personal info pages which it is- and easy to set up- great for one up on their peers.
A little niche for mobile business/personal cards. Limitations as they can't be developed. Been a few small sales up to low- mid $xxx I believe.