How to unjailbreak iphone 4? - 1

So my phone is jailbroken and unlocked. I know that you can unjailbreak it from itunes by doing the restore thing but if i do that will it take off the unlocked thing? I use h20 companybthing as my sim card and in order to use any sim card do i have to have thd unlocked feature? My brother has the same sim card but his iphone isn't unlocked and is working perfectly fine. I have an iphone 4, version 4.3 please help me i want to update my phone but i can't due to the jailbreak.

If something is jailbroken, it's unlocked.

Are you SURE that it has been unlocked before the jailbreak?
If it was already unlocked then do the restore and you MIGHT have to unlock it again. Your carrier place can probably do that for you or you can look online.

Go to APP Store and the supporter would help you. This could be done soon.

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