Two iPhones, one number: iOS 27's Handoff
When iOS 27 lands later this month, Apple will add a feature called iPhone Handoff that lets you switch between two iPhones using the same phone number; a demo in Xcode 27’s Device Hub shows pairing a main device with a companion, though carrier support (with references to T-Mobile US and Telekom.de) will be required for full functionality, likely timed to the broader launch window around Apple’s foldable iPhone Ultra.