As promised, AT&T's 2G network went dark on 1/1. My primary SIM is my TMobile SIM and my AT&T was on 'standby' in my 950 XL DS. As such, I always had my phone configured to have my TMobile SIM as the primary data SIM and the AT&T secondary. Can't do that anymore, as my AT&T SIM will no longer be recognized. Had to change it to the 'primary' (for data) and my actual primary (TMobile) as secondary. A pain to switch back and forth and will definitely make me reconsider a dual SIM phone in the future, as well as whether or not to keep my 2nd line (ATT). TMobile will not be shutting their 2G off for a few more years.