When Apple pushed iOS version 12.1.1 on Wednesday, AT&T users gained the ability to use the iPhone XR, XS, and XS Max’s in a dual-SIM configuration. Verizon users will be able to set up a similar situation on their devices use it starting tomorrow, December 7….

Source: https://lifehacker.com/how-to-use-dual-sims-on-an-iphone-xr-xs-or-xs-max-1830916251