You would have to S-Off to be able to do that. Is this for the Sprint version? If so, the international unlock works well, but if you want to use it in the US, you will most likely have a lot of connection issues trying to stay connected to the towers when you move. It likes to drop off and you have to reset it a couple of times to get service back. Very frustrating. If you don't have the Sprint version, disregard.
Need some help, advice, something fixed? Hit me up on Hangouts @ es0tericcha0s and check out my site: http://mobilemojo5280.com
for more info!
HTC Droid Eris / Motorola Droid / Samsung Galaxy S Fascinate / Motorola Droid X / LG G2x / HTC Evo 3D (x2) / Samsung Epic 4G Touch (Sprint S2) / HTC Amaze / Samsung Galaxy S3 (International) / Samsung Galaxy Note 2 / Nexus 4 / HTC One / Samsung Galaxy S4 / Sony Xperia ZL / Nexus 5 / ? (One+1 maybe...)