I just got this email from one mom blogger friend. Amazing and very helpful things i learned. We mothers need to know all this tricks. Enjoy!

FIRST - Emergency
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.

SECOND - Have you locked your keys in the car?
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 the doors
(or the  trunk). - Wow this is i haven’t try yet!

THIRD - Hidden Battery Power
Imagine your cell battery is very low. To activate, press the keys *3370#.
Your cell phone will restart with this reserve and  the instrument
will show a 50% increase in battery. This reserve will get charged 
when you charge your cell phone next time.

FOURTH - How to disable a STOLEN mobile phone?
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 get 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 everybody does this, there
would be no point in people stealing mobile phones.

FIFTH - Free Directory Service for Cells
Cell phone companies are charging us $1.00 to $1.75 or more for
411 information calls.  When you need to use the 411 information 
option, simply dial: (800)FREE411, or (800) 373-3411 without 
incurringany charge at all. Program this into your cell phone.

This is the kind of information people don’t mind receiving, so
pass it on to your family and friends.