NCR Counterpoint Mobile 2.6 has been certified for use on devices running iOS 12.
CPMobile 2.6 is not compatible with iOS 10 or earlier. If you are using one of these versions, you must update your CPMobile devices to iOS 11 or iOS 12. CPMobile 2.3.1 is still available for devices that cannot be updated to iOS 8.1 or later, including the iPhone 4 and the 4th-generation iPod Touch.
If you upgrade your CPMobile devices from iOS 6 or earlier, you must "unseat" and re-register each device before you can begin using CPMobile 2.6.