This app is a simple to use tool to assist installers with configuration of 2T-Technologies new 4G 2 Relay GSM Switches. When configuring these devices this App formats an SMS text to carry out the installers preferred configuration option. It presents the text for his review and he can then send the text or cancel and return to the app to make a different choice. This application is compatible with 2T Technologies New Voyager 4G-2R GSM Switch. (see www.2t-tec.com)