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I got a very simple idea when I was recharging my mobile using the normal way, scratching a card to get a secret code and either calling recharging automated service or requesting a shorthand like in Vodafone *858*secretcode#

I suggest adding the shorthand substituted with the secret code as a QR code!
Then when I scratch the card I get the QR code as an alternative way to recharge besides the code for manual recharging.

The motivation is that most of phones now have built-in QR readers or it can be installed as a third-part application, which will quickly translates the QR code to theĀ correspondent code and you can quickly call it!

Vodafone Egypt Example:
The shorthanded code to charge with secret code *858*12345678901234#
The Generated QR code:
qrcode

What do you think?