1) The emergency number worldwide for a mobile phone is 112. If you find yourself out of the coverage area of your mobile network and there is an emergency, dial 112 and the mobile will search any existing network to establish the emergency number for you, and interestingly enough, you can even dial (112) if the keypad for your cell phone is locked. Try it out. I have, and I tell you -- it works!
2) Have you ever locked your keys in the car? I know I have. Does your car have a remote keyless entry? At least one of my cars does. The following may come in handy someday - and it's reason enough to own a cell phone: If you lock your keys in the car and your spare remote is at home or with your spouse, call that person on their cell phone from your cell phone. Hold your cell phone about a foot from your car door and have the person on the other end (the one with the spare remote) press the unlock button, holding it near the mobile phone on their end. Believe it or not, your car will unlock. I'd have never believed it if I hadn't tried it myself. Saves someone from having to drive your keys to you, and distance is no object (but let me clarify -- if you're in Tokyo and for some reason the other remote is in Toronto, then unfortunately you ARE screwed). But if you are hundreds of miles away, and if you can reach someone who has the other "remote" for your car, you can unlock the doors (or the trunk).
3) Now imagine your cell phone cell battery is very low. To activate your phone and tap into the phone's hidden battery power, press the keys * 3 3 7 0 #. Your cell phone miraculously will restart with this reserve power and the cell phone will register a 50% increase in battery charge. This reserve power will get charged when you charge your cell phone next time.
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