How do find your own phone number is iPhone 5 or 4S?

I have installed iOS 6.0.1 and got a new sim. I've lost the sim card packaging and so badly need to know the number of this sim. How can I find out? Please help.
It doesn't show up in contacts or anywhere as it used to in old OS. I do not have credits to miss call either. So please help, thanks!

Added (1). Answers so far didn't help guys. No credits to leave a miss call and its not there in About section or under Contacts… Any other ways?

Whit your Iphone 5 or 4S call your home phone and figure it out.

It is where it always was - in settings -> About
You can also see it on the top of the dialing / contacts page
Apple explaination
http://support.apple.com/...cale=en_us
Example picture (no Blacked out)
http://www.everythingicafe.com/forum/threads/display-of-own-number.45694/

It does show in ios. Click phone. Tap contacts, scroll right to the top and your find my number.
It works on my iPhone 5.
Hope this helps

I can't Belive that