Anyone can turn a smartphone or tablet into a mobile card reader, but it’s not as easy to turn a phone into a contactless payment device if it wasn’t built that way. Some companies aim to change that.

On Track Innovations, or OTI, this week launched Copni Wave, a device that adds a Near Field Communication payment function to phones the same way Square Inc. adds a card-reading function — by plugging a small device into the phone’s headphone jack.

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