Will updating my iphone 4 to ios 6 will disable its carrier unlock?

My Iphone 4 is currently running on ios 4.3.3 and I wish to update it to the new os (the ios 6), but don't want to lose its carrier unlock. I don't actually know if its an official factory unlock or what but what I know is that the Iphone is not jailbreaked (So If I assume right, Is it really a factory unlock and won't be affected by any update?). Please give the answers not involving a jailbreak.

Software 6.1.1 is released n you may update your iphone. If its Factory Unlocked nothing harmful is going to happen at all. & it will work fine wid your machine…
However jailbreak goes away wid software updating…
your idea is good to update da fone

If it is not jailbroken, then it probably is a factory unlock or imei unlock in which case updating will not cause you to lose your unlock