It’s no secret that the iPhone is much more than just a smartphone. Apple has even started giving iPhones to Apple Store Concierge employees to schedule appointments and manage the store.

The ability to complete mobile transactions with credit card terminals is a great use of the iPhone for employees on the go or companies that do home or office calls. Like most applications in the iTunes App Store, there is no shortage of alternatives available for you to try. Here’s a roundup of some of the most popular credit card terminals for iPhone.