Inside this bare-bones phone, you'll find a single lithium AA battery that will last up to 15 years from the time you pull out the tab and turn it on. Right out of the box, it can make emergency calls – and you can insert your GSM SIM card and talk for up to 10 hours before you need to replace the AA cell. Sure, it doesn't have 'Angry Birds,' but it might save your life. [$70; spareone.com]