While we're giving cell phone tips: in an emergency, you should dial 911 even if you don't think your phone has service. It will try to connect to competitors c

While we're giving cell phone tips: in an emergency, you should dial 911 even if you don't think your phone has service. It will try to connect to competitors cell towers that would normally be ignored. Likewise, you can call 911 on a "disconnected" phone or one with no SIM card.