Accept Credit Card Payments from Your iPhone, iPad, or Android

Last Updated May 19, 2010 12:14 AM EDT

About 15 years ago, a musician friend of mine asked me if I could recommend a good way to take credit card purchases on the go. That way she could easily take credit for t-shirt and CD sales at concerts. At the time, I didn't know of many practical solutions. If only she asked me today, I'd finally have a great option for her to consider.

Square is a mobile credit card authorization system for iPhone, iPad, and Android -- with more devices to be supported later. To use the service, you get (for free) a small credit card reader that plugs into the phone's audio jack. Customers sign their name on the phone, and the transaction is authenticated for a fee of 2.75% plus 15 cents.

If your business is mobile and you have been waiting for an easy way to take credit card payments on the go, definitely give Square a look.