We all hope that in our first few days, weeks or months in Luxembourg we will not have to deal with an emergency, but even if you’re not a girl guide, you should "be prepared". Always keep a copy of your CNS, E111 or Private Insurance details with you. And if in doubt, dial 112.
You should call 112 if you have a medical, fire or rescue emergency, if your vehicle has broken down (and you don’t have cover or you’re trapped inside your vehicle) or if you need a locksmith. Most emergency operators speak English (try to speak clearly as operators may not be native speakers). Lines are open 24/7. You will be required to give your name, contact number, exact location details, the nature of the emergency and number of people involved.