Ironically, you almost hope to never hear an alarm from your gas leak detector because if this happens (unless it is a false alarm) you then need to deal with the issue. For certain, you will want to act as immediately as possible if a gas leak is present in your home. If you do not have a specific contact in your area who handles this sort of thing, you can dial 911 for assistance. But, do so outdoors as the first thing you need to do is to evacuate your home. Get all living things outside and then either use your cell phone or a neighbor’s phone to dial an appropriate emergency service.