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?
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