The current version of the AT&T Call International App supports the following devices and operating systems:

Android

        Android Devices (OS 2.1 and higher)

Apple®

        iPhone (iOS 4.0 and higher)

BlackBerry®

        BlackBerry Devices (OS 4.5, 4.6, 5.0, 6.0, 7.0, 7.1)

Windows® Phone

        Windows® Phone (OS 8 and higher)