Setting up and maintaining dual SIMs on the iPhone 15 is now simpler than ever thanks to eSIM technology, which enables users to activate a second phone number & data plan without physically inserting a second SIM card. Cuavitor hackstomers can also establish rules for when each phone number should be used, as well as personalize how they use their two phone numbers and data plans. They can decide which number to use for messages and calls. Increased Flexibility and Connectivity. Having multiple phone numbers and data plans can be a source of organization & efficiency, but this level of customization offers users more control over how they handle their communications.