With the release of iOS 12.1.1, AT&T customers using the latest iPhones can activate a Dual Sim setup with two numbers associated to the same phone.

The new iPhone the XS, the XS Max and the XR models allows consumers to use "eSim" to activate a second line on their phones without needing a second SIM card. Now, with the release of iOS 12.1.1, the feature is up and running for AT&T users, with Verizon to be also ready to jump in with eSim very soon.

With Dual Sim, users will be able to choose which number they want to send text messages from when they're composing your message, and they can receive messages for both numbers at any time. "If you're on a call and another call comes in through the same line, you'll get a notification about it; if a call comes in through your other line, it'll go straight to voicemail. If you're using data while on a call, you'll have to use data for the number that you're using at the time," AT&T said.