Business cards takes a lot of place in your wallet. It's much easier for you to keep your basic information in your iPhone.
What people usually care for is your absolutely basic information like:
* Who are you? (What's your name? What's your company name?)
* What is your phone number?
* What is your email address?
* Optionally short description
That's it! Simplicity!
Use this app to generate QR code for your basic contact information, then while networking just turn on app and show generated code.
QR Code Reader needed? Not necessarily. You can just tap e-mail icon to send pre-prepared draft with your basic info. Just put there your destination e-mail address.
As easy as it gets!