Does a factory unlocked iPhone let you update the OS without undoing the unlock?

I've looked at an iPhone 4 which is factory unlocked phone according to the seller on Ebay. I heard that if you don't have a lifetime unlock/permanent unlock you won't be able to update the iOS without locking the phone. I want to update my phone when iOS 6 comes out and want to keep the unlock. Would this be possible with a "factory unlock"?

IPhone 4 is unlocked via gevey sim except baseband 4.11 or 4.12, which can be only factory unlocked.

Yes update will not lock a factory unlocked iphone.

Http://attiphoneunlocker.com/
You can safely update the OS on your handset at any time, and sync your device with your computer without fear of Apple removing your unlock.
Your iPhone Will Stay Unlocked Forever, Works On Baseband 4.11.08 & 4.12.01
Works On iOS 5 / 5.0.1 / 5.1 / 5.1.1
Works On All Firmwares

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