This phone has been unlocked and is no longer on Verizon. But APN settings are grayed out. Most features working with a SIM from Consumer Cellular (on TMobile network) but we can't do WiFi calling because it must be enabled in APN settings which we can't change. Verizon won't help non-Verizon customers even though this phone came from them and the user was on their service for years. I can enter new values in APN settings but it won't save them. Will appreciate a solution!!