Samsung Galaxy Note 2 — please help update to an unlocked phone

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Jun 24, 2013 5:41:46 AM via Website

Can someone please help? I use a galaxy note 2 its tmobile but it's unlocked for any company so I use it for at&t. I have an update for the phone, if I Update it will I still be able to use It for at&t? Or will I have to unlock it again? Please help & thank you in advance.