this is a really different feature for your cellphone, provided you have a Siemens MC 60 mobile phone. it’s the ability to use the phone as a magnetic card reader. how you ask? the MC 60 has the ability to record sounds to use a ringtone or whatever. when a card has data on it, and you swipe it through a card reader, it will make a “swoosh” sort of noise. these are the two tones the card makes..the two tones being 1 and 0. after this, the binary data is read and interpreted with whatever information may be on it. 2600’s Off the hook was talking about this on their show a few weeks ago, and how it’s used with metrocard