The easiest way to share your contact information
You just show the other person the lock screen and ask him to turn on the camera on his smartphone is the easiest way to share your contacts.
No more numbers, forwarding from another's smartphones and uncomfortable requests to remind the name. The solution is a QR Card. The application makes contact exchange as quick and convenient as possible. An ordinary business card can simply be thrown out or lost. Contact in a smartphone is a completely different matter.
To add you to your contacts, you do not need a separate application. The camera can already recognize QR codes.
Optional: A QR code on the lock screen increases the likelihood of your smartphone returning to you if it is lost. The finder simply scans the QR code and can, for example, write you an e-mail or call your work phone.