Apple is showcasing a new feature in its upcoming iOS 27 operating system called iPhone Handoff, which allows two iPhones to share the same phone number. This feature would let users connect two devices to a single phone number, enabling them to switch between them seamlessly while keeping the same number. The feature was revealed during Apple's Worldwide Developers Conference (WWDC) in 2026 and was recently demonstrated on the MacRumors forums using two simulated iPhones running iOS 27. To use iPhone Handoff, one iPhone must be designated as the primary device, while the second functions as a companion. The main device will continue to use a traditional eSIM card, whereas the secondary device will need a companion eSIM linked to the shared phone number. This functionality requires support from mobile carriers, and while international providers like T-Mobile and Deutsche Telekom may be among the first to offer it, it is unclear whether French carriers will support the feature. The phone number will automatically activate based on which iPhone is unlocked, with a visual notification appearing in the Dynamic Island — a feature on newer iPhones that displays interactive alerts. This could allow users to repurpose older iPhone models, giving them a second life and potentially reducing electronic waste. If Apple follows its usual release pattern, iOS 27 is expected to launch later this month, in September 2026, after three months of beta testing with developers and users.