You probably didn't know your mobile phone could do this!

[Berniman]

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.

[reeves4england]

Didn't know the second and third ones! Top stuff if true

[axs]

i'm scared to do it in case my phone gets the bad aids.

[mattboyslim]

I knew about number one, number 4 works, however fear of the phone aids, even for my work phone precludes no 3, and as for no 2 I don't think remote central locking is the same as keyless entry.

[Simon Pieman]

Number 1 is a known one. Same as you can dial 999.

Number 2 has been done on Braniac and it WAS proven to be true. I think they may have done it on Mythbusters too.

I tried number 3 (I've seen this before) and it didn't do anything.

Number 4 I knew because they ask you to do it if you're registering a phone.

Taking a call from Miss Angry gives your phone the bad aids though. Watch it kids.

[Simon Pieman]

Also what sort of plank could lock their keys in the car if it's remote central locking?  

[axs]

you'd have to lock it with a door open, then throw the keys inside and then shut the door. easily done.

[Miss Angry]

Taking a call from Miss Angry gives your phone the bad aids though. Watch it kids.

Will you leave me alone... no one else has got bad phone aids from me and god knows im on it enough!
I think you just dont like the fact i didnt sit with you that day :p

[BANGKOK RED]

Bugger me, that's as cool as, especially the re-charge thing as I could have done with knowing that a few times before.

I'm amazed really that it ain't all common knowledge and people should be told!

[axs]

http://www.truthorfiction.com/rumors/c/cell%20phones.htm

or is it all bollocks?

[mattboyslim]

my car automatically locks if it's unlocked and left for too long, I think that if you left the keys inside it's lock them in, thankfully I've never fallen foul of this.

[frantically looks to touch wood] touches wood [/frantically looks to touch wood]

[BANGKOK RED]

Number 3 works, I just tried it!

[axs]

doesn't work for me.

although I thought 112 was definately the international emergency number.

[RobertT]

Number 4 is just one of a whole host of old GSM standard codes that act like a shortcut and should work on all phones these days.  They include such exciting functions as barring calls, setting up diverts, setting up voicemail, getting your own mobile number to display etc.  90% plus work across all networks and phones.

Number 1 used to be a big issue with the Emergency Services before flip and slide phones started becomming so popular.

[RobertT]

doesn't work for me.

although I thought 112 was definately the international emergency number.

It is, works the world over and allows any Network to be used even if your phone is locked to a specific one.