The phone is not required to be special. They don't need to design new hardware from scratch. All they have to do is to rebrand existing phones. The phones are

The phone is not required to be special. They don't need to design new hardware from scratch. All they have to do is to rebrand existing phones. The phones are simply Android phones with different app store with different policies. Users can install from Google if they still want. If fact they can rebrand another phone and add another appstore.