Re: How to retrofit bonk-pay to your existing Smartphone
That can lead to scratching the phone.
Scratching the back of the phone? Oh no!
Also, what kind of phone do you have which can be scratched by a plastic credit card? Is the case made of unfired clay? (Try the new Samsung Adobe!) Chocolate? (When the Godiva Phone stops working a year after you bought it, you can eat the delicious case!)
Personally, I don't use NFC payment anyway. But if I did, I certainly wouldn't be worried about scratching the back of my phone.