At least they do in Singapore. All you have to do is tap your NFC capable phone to the scanner. NFC stands for near-field communications.
So basically this works a lot like most of the newer credit/debit cards that are coming out with the scanning technology were you just have to tap your card to the reader and off you go. The only difference it works with cell phones instead, this may not be the first mobile phone based payment system, but it definitely seems like the most functional.
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