Does unjailbreaking an iPhone lock it?

I got an iPhone 4S and it is unlocked. (I believe) It's still on iOs 5.1.1 and I want to update it to 7.0.3 but first I want to unjailbreak it. Why do I want to? I don't know. Lol But will unjailbreaking it cause it to lock? I checked the Profile and it says APN Carrier Settings. I'm not sure what this is. So what should I do? Unjailbreak it via iTunes or just leave it jailbroken and update to iOS 7

No, just press Restore instead of update in iTunes, and it'll be unjailbroken and updated at the same time…

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