HT204023 What is 'sim pin' under Cellular data on my iPad mini?  How do I use that and change cards from one country to another?

I have a new ipad mini with retina display, and cellular capability.
I've learned how to set up an account and use it in the US.  I'm now traveling internationally and need to learn about changing the sim card.
My first question is about the notation under 'settings', Cellular Data, SIM PIN.  Under SIM PIN, there is an option of turning on 'sim pin' and then entering a PIN to lock the SIM.
What does SIM PIN mean in the first place?
Where does the PIN number come from?
Thankx.
SusanFrances

A SIM PIN, also referred to sometimes as a PUK Code is like a PIN number for your SIM card (just like your ATM Card).  Since your SIM card has your cellular account on it and can be typically removed from one device and put into another, you can lock the SIM Card with a SIM PIN if you choose.  If you activate the SIM PIN feature and forget your SIM PIN when you try to re-activate your device or a new device in the future using the same SIM Card, you may have to contact you carrier to get a new SIM Card. http://support.apple.com/kb/ht1316
As far as changing the SIM Cards out because you want to use a new carrier, you can remove the SIM card fomr the old carrier and put in the SIM  card form the new carrier. http://support.apple.com/kb/ht5163
I hope this helps clear things up.

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