Android One is a bare version of the Android operating system. This means that no unnecessary apps are installed on your phone. This saves memory and, on top of that, an Android One smartphone works a lot faster. In addition, your phone is well-protected against the evil outside world. You'll receive monthly security updates on an Android One smartphone. When you buy a separate device from Coolblue, it's SIM free. This means that you can use it with a phone plan from any provider.