If you get into any trouble on the metro, just scan this bar code into your mobile phone (maybe not an iphone) and get a hotlink to the help line.
Interesting idea. Do you have metro hotlines in your part of the world or do the offices try to stay away from customers?
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You can get a number of scanners for iphone for that type of barcode. (whose particular name escapes me but we are seeing them pop up in Australia!)
The scanner I use is called ‘bee tag scanner’ and is available via the itunes app store