Quite a bit of hype surrounds Square,
the mobile payment processing service founded by Twitter co-founder
Jack Dorsey. But mobile payment processing is hardly a new concept, as
companies like Symbol (now owned by Motorola) have long offering a wide
array of devices.

The big deal is not the concept, but the fact that you can turn your
iPhone or other mobile device into an on-demand payment processing service.

Read more: http://mobile-financial.com/node/3488