How to make my app only on iPhone 4S and higher? My app is for a smart device and uses Bluetooth Low Energy. I would like to enable my app only for iPhone 4S and higher. Is that possible ?
You can restrict your app to devices having certain capabilities. 

In the Info.plist file add a new key UIRequiredDeviceCapabilities with an array as value. You can put all your required capabilities in the array. In this case bluetooth-le.