I might be in the market of the cheaper version iPhone this year, XR over XS. If USB-C iPads get announced next Tuesday, then it's probably a good bet that next years flagship iPhones will adopt USB-C over lightning. Are the carrier phones (T-Mo, Sprint, Verizon, ATT) the same as the SIM-Free version if I bought them outright? or is the ATT and Spr ones CDMA again and locked to that system? Has a sim-free version been announced?