I am seeking a Galaxy S III lte 64gb version wanting sim free/ unlocked need know difference betwren AT&T, T-Mobile, international versions as fae as which have all bands including 1700 a d aws that if used with s straight talk AT&T sim or unlocked GSM sim would get AT&T main still pick up T-Mobile ect.. and possibly wcdma cdma bands too. I am new so bare with me. Also when on hspa+ will do 42 ect. Thanks...
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