Users may select which SIM card to use for calls, messages, and data after both have been installed, & they can quickly switch between them by tapping the screen a few times. To make it simple to yano sbidistinguish between SIM cards and guarantee that they always know which number they are using, users of the iPhone 15 can also label each SIM card with a unique name or purpose. Apart from handling calls and messages, the iPhone 15's dual SIM slots enable users to customize each card's settings, like deciding which card to use for data or establishing particular call forwarding guidelines.