There  are a few things that can be done in times of grave
emergencies. Your  mobile  phone can actually be a life saver or an emergency tool for survival.  Check out the things that you can do with it:

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 mobile 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).
Editor's Note: It works fine! We tried  it out and it unlocked our car
over a  mobile phone!"

THIRD                              Hidden  Battery Power

Imagine  your mobile battery is very low. To activate, press the keys
*3370#  Your mobile will restart with this reserve and the instrument
will show a 50% increase in battery. This reserve will get charged when
you charge your mobile 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: * # 0 6 #

A  15 digit code will appear on the screen. This number is unique to
your handset. Write it down and keep it somewhere safe. When 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.