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Paying with a credit card
Jupiterimages/Getty Images/Goodshoot RF
(Image: ThinkStock)
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Square

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.
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Intuit GoPayment

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.
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VeriFone PayWare

Why didn't they call it the Ver-iPhone? PayWare was VeriFone's first attempt to compete with Square for small merchants.
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VeriFone Sail

VeriFone's smaller Sail reader will eventually include open-source software so that tech-savvy merchants can use it with their existing systems.
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PayPal Here

The card reader isn't even a necessary component for PayPal's Here. The app can read cards using the phone's camera.
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Card.io

Card.io provides the tech behind PayPal's camera-based card reader.
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Camera phone
Stuart Dunn/Getty Images/iStockphoto

Flint

Flint uses an optical character recognition system to read card account numbers using a phone's camera. (Image: ThinkStock)
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Jumio

Jumio isn't strictly mobile. Desktop computer users can also read cards with a webcam using Jumio's tech.
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Closeup of man's hands writing a cheque
Elena Elisseeva

Checks

Merchants can also use a bank's remote deposit capture service to deposit checks on the go. (Image: ThinkStock)

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