Customers can select the ideal plan—for data, talk time, or messaging—for each of their phone numbers and switch between them as needed. This can guarantee that customers always have access to the best service for their needstaakigs and lead to significant cost savings. In addition to offering extra security & peace of mind, the dual SIM slots allow users to have a backup SIM card in case of emergencies or outages on one network. The iPhone 15's dual SIM slots function flawlessly to give users the best possible connectivity & convenience. Adding both the primary & secondary SIM cards to the device is a simple process that users can accomplish through the settings menu.