Its one of those ideas which make you wonder how on earth no one has thought of it till now, how come I have never thought about it?! A company called Square (started by one of the co-founders of Twitter) has made this a reality. You can turn your iPhone, iPad or any mobile device which can run their app into a credit card accepting gizmo. If you have the card number, you can type it in manually, or you can swipe their card through a small square shaped reader which snaps onto the phone's headphone jack, of all places. Want to "square" your debt with your friend? No need for Billmonk and tedious bank transfers anymore, just swipe it through!
David Pogue on NYTimes has more.
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