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To use your AT&T Samsung Galaxy S3 with T-mobile network,you need to unlock it from current provider.Get the unlock code from the site Simpleunlocking.com and get free Unlocking instructions from the site Mobileunlockguide.com ,unlock it step by step easily.
u can get the latest firmware direct from samsung.com and the go to http://www.samsung.com/uk/support/download/supportDownload and type your model no hope this helps thanks john
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