OnRelay for iOS
OnRelay's Office Phone app for iPhone uses an extensive array of Apple application programming interfaces to achieve a seamless integration with the iOS operating system. The OnRelay app will not impact the power consumption on the device even if it is allowed to run in the background. It is written natively in C++ and objective-C to achieve the best possible user experience.
OnRelay for Android
OnRelay's Office Phone app for Android is designed to support a widest possible array of devices from a wide range of manufacturers. The native Android Java application has been iterated many times over to provide a seamless user experience with any Android device. In its background operation it will occasionally wakeup to maintain server connections without significantly impacting device battery life.