Using a Samsung Tablet 10.1 based on Android 3.1
I tweaked for fun some options and was suddenly receiving empty cell broadcasts CBSMS at 04:00.
I suggest you start the Android Messaging App, and then look for Settings in the menu.
You should find several “broadcast” / CB type of options. Just deactivate them. At this time to the best of my knowledge no services have ever been published to use this feature in Switzerland.
Regards Richard