If you purchase an Iphone 6S plus T mobile version for full price from the Apple Retail store for $949 the store employees are saying its unlocked and the same as the SIM Free 128 phone is this true and does it have the band 30 for AT&T, there appears to be a shortage of Sim free 128GB 6s Iphone Plus she said the TMobile was the same thing although the model number was different. Any one know about this?