I purchased a launch day iPhone XS Max using the iUP program for AT&T. I have transitioned the AT&T to the eSim and use a traditional Verizon sim. Verizon does not recognize that the iPhone via IMEI that it can be used on their network and so I am not able to use advanced features like Visual Voicemail, HD Calling, Wifi Calling, etc. The iPhone is factory unlocked as I tried a wipe and received the unlocked message. Verizon / Apple have been very confused on why this is and point the finger to each other. This is what I have attempted: Removing AT&T and use Verizon solely with no luck. Downgrade to iOS 12.0.1 with no luck. Swapped Verizon SIM cards with no luck. Purchased a new unlocked, sim-free iPhone XS Max and it will not provision to Verizon either. (Today) Purchased an unlocked, sim-free iPhone XS and it does provision. (Wife's from launch day) Purchased an unlocked, Verizon-sim iPhone XS Max and it does provision. (Today) Any other clues? All my other iPhones 6, 6s, X all were unlocked and Verizon was able to use them using the IMEI. Verified using Verizon BYOD site to check IMEIs. Error from Verizon, "The phone associated with the Device ID you entered is not compatible with the Verizon Wireless network."