US-centric: Free cell phone service Dial DIR-ECT-IONS (347-328-4667) sends driving directions to your phone via SMS. Just call their number and step through the voice-activated menus, telling it where you want to go and where you're starting from. You should receive a text message on your phone a few seconds after you hang up detailing turn-by-turn directions from your start point to your end point. It's no substitute for a fancy Google Maps application or GPS, but if you have neither it's a simple and useful way to get quick directions on the go. The service currently only works in these nine cities with more on the way.