They are already out, you can find them on amazon. I was considering buying one that hooks up to the USB of the phone, but decided to go with a stand alone unit.
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They are already out, you can find them on amazon. I was considering buying one that hooks up to the USB of the phone, but decided to go with a stand alone unit.
There are add-ons, but I'm talking native to like an iPhone or Google Android phone, in a few years they will likely be added to a few of them.