I received this as an email from Richard's mom the other day and was amazed at some of these things. I have not tried them, but thought I would pass them along. Let me know if you know that any of these work or don't work.
1. The Emergency Number worldwide for Mobile 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, this number 112 can be dialed even if the keypad is locked. Try it out.
2. Does your car have remote keyless entry? This may come in handy someday. Good reason to own a cell phone: If you lock your keys In the car and the spare keys are at home, call someone at home on their cell phone from your cell phone. Hold your cell phone about a foot From your car door and have the person at your home press the unlock button, holding it near the mobile phone on their end. Your car will unlock. Saves someone from having to drive your keys to you. Distance is no object. You could be hundreds of miles away, and if you can reach someone who has the other 'remote' for your car, you can unlock th e doors (or the trunk).
EDIT: See Natalie's comment.
3. Imagine your cell battery is very low. To activate, press the keys * 3 370#. Your cell phone will restart with this reserve and t he instrument will show a 50% increase in battery. This reserve will get charged when you charge your cell phone next time.
4. To check your Mobile phone's serial number, key in the following Digits on your phone: *#06#. A 15-digit code will appear on the screen. This number is unique to your handset. Write it down and keep it somewhere safe.
If your phone gets stolen, you can phone your service provider and give them this code. They will then be able to block your handset so even if the thief changes the SIM card, your phone will be totally useless. You probably won't get your phone back, but at least you know that whoever stole it can't use/sell it either. If every bo dy does this, there would be no point in people stealing mobile phones.
5. Cell phone companies are charging us $1.00 to $1.75 or more for 411 information calls when they don't have to. Most of us do not carry a telephone directory in our vehicle, which makes this situation even more of a problem. When you need to use the 411 information option, simply dial: (800)FREE411, or (800) 373-3411 without incurring any charge at all. Program this into your cell phone now.
(Or you could just dial 1-800-GOOG-411)