ATT is sitting on this one… It seems that ATT has decided to not support the SM-N950U1 model ( unlocked Galaxy Note 8 ATT phone ) with the 3G cut off. It has the same protocol support as the SM-N950U model which is the model ATT sold in their stores and is supported. After going to the ATT store and 2 calls to support line I have a ticket opened which hopefully they will answer with their decision… Unfortunately, at the moment their is no fix that I am aware. ATT will need to make an executive decision to support the unlocked Galaxy Note 8 on their network or you might need to acquire a new phone… Currently none of the phones ATT sells has an external SD Card and a Stylus like the Galaxy Note 8.