Exchange your contacts with every smartphone using QRCode, its easy.
Simply touch the left picture to send yout contact : pickup a contact from the list and the QRCode will be created and displayed at fullscreen so your friend can read the contact from the screen (using for example Barcode Scanner by ZXing on other phone platform).
To receive a contact with qrCard simply touch the right picture and the camera will start : frame the QRCode and automatically the standard Add contact form will be displayed.
The QRCode with phone number and web link are recognized too