Red Phone - the One Touch Call App Presidents around the world, Stargate®-General Hammond or Batman® use it. Now, it's also available for iPhone. How it works: 1) The first time the app is launched, a specific phone number can be selected. 2) After that, you can do one-click calls from your home screen to the selected number. 3) If you want to change the phone number, you have to switch on the edit toggle in Preferences -> Red Phone. Enjoy this great, helpful App!