Paygistix Mobile allows you to easily accept credit card transactions on your Apple device and is compatible with 100s of merchant account services providers. HOW IT WORKS1. Compatible Devices: iPad 2, iPad 3, iPad 4, iPad Air, iPad mini, iPad mini w/Retina Display, iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPod Touch 3rd Gen., iPod Touch 4th Gen., iPod Touch 5th Gen.