iOS 12 vs iOS 11: What’s New in iOS 12.4.1

eSim Support for Dual SIMs

Apple finally adds in support for dual sims on the iPhone XS and iPhone XS Max. The iOS 12.1 update enables this feature announced alongside the new iPhones in September.

With this feature turned on, users will be able to add in a second phone line on the iPhone XS or iPhone XS Max without swapping SIMs. This is an eSIM, so you don't need to put a second SIM into the iPhone either.

You'll need to wait for carriers to support the feature, but the good news is major U.S. carriers and several global carriers already promised support is coming, so you may be able to do this as soon as this week.