Mandatory "Portuguese here".
All forms of communication are banned. Unless it's an emergency, and this is where it gets a bit grey because they haven't defined what exactly is an emergency, so things will probably stay the same in most cases.
Another reason why it won't mean much is that the employee is the one that needs to make a complain with the work authority, and then work authority has to evaluate the case and decide it they will issue a fine or not.
So what this really means is that if my boss contacts me after work hours I can (and should) ignore him without any repercussions.