Does restoring an unlocked iPhone with a backup re-unlock it?

So I'm thinking about trying to update my iPhone 4's iOS. I've checked the IMEI number with several websites, and they all say it's sim unlocked, but I'm worried that it isn't, and so if I make a back up of my current iOS and then try updating it, could I restore it with the backup to the previous iOS and it be unlocked again? (This is all if it gets re-locked from the iOS update.)

If its jailbroken unlock… The itunes restoral will un jailbreak it and re-lock it… Thus making it act like you just got it at the carrier store

if its Apple unlocked or Carrier unlocked (by ATT for example), itunes restoral will keep it unlocked, since the unlocked was programmed into the phone by an administrator and not done by a prgram hack. LOL

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