The "Red SMS" App for quick messages.
Presidents around the world, Stargate®-General Hammond or Batman use it.
Now, its also available for iPhone®.
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How it works:
1) The first time the app is launched, a specific phone number from the iPhone-address book can be selected.
2) After that, you can do one-click SMS 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.
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