The ThermoCall app now offers drivers the convenience of preheating their engine from a mobile phone, which can reduce idling and extend engine life, company officials said. Up to two heaters can be operated via text message or a phone call, and the heater startup time is designed to be programmed up to 24 hours in advance. A heating duration time can be set to save fuel, and the app can store up to five authorized phone numbers. The app is available in the Apple AppStore and in the Google Play store.