yes it will lock it back,you have to be jail broken to be unlocked..You need to Re unlock it...
To Unlock the I-phone from network lock use the Remote I-Phone Unlock service it's best and simple than going to store and Unlock it.To get the Remote I-Phone Unlock service visit the site Ihav.net
buy the Unlock service and Unlock it..
If the previous unlocking method was a temporary one, then your iPhone will get locked again after an iOS update. If you want to unlock your iPhone permanently I would suggest you to get the remote unlocking service from ClassicUnlocking.com This method of unlocking an iPhone is safe, simple, affordable, quick and permanent. It doesn't require a jailbreak too.