Square is pushing past its original market of babysitters and gardeners with its Register app, which it says is robust enough to replace conventional point of sale systems.
Intuit's latest update to its GoPayment card reader uses the phone's GPS to calculate the proper local sales tax. Cash can't do that.
Why didn't they call it the Ver-iPhone? PayWare was VeriFone's first attempt to compete with Square for small merchants.
VeriFone's smaller Sail reader will eventually include open-source software so that tech-savvy merchants can use it with their existing systems.
The card reader isn't even a necessary component for PayPal's Here. The app can read cards using the phone's camera.
Card.io provides the tech behind PayPal's camera-based card reader.
Flint uses an optical character recognition system to read card account numbers using a phone's camera. (Image: ThinkStock)
Jumio isn't strictly mobile. Desktop computer users can also read cards with a webcam using Jumio's tech.
Merchants can also use a bank's remote deposit capture service to deposit checks on the go. (Image: ThinkStock)