Overview
- A leaked demo first published this week shows iPhone Handoff in iOS 27 lets a single phone number and cellular plan be shared between a primary iPhone and a companion iPhone using two eSIM profiles.
- Setup lives in Settings > Cellular where a user designates a main device that keeps the primary eSIM and a companion device that receives a companion eSIM, with cellular controls remaining on the main phone.
- The demo indicates the active number automatically switches to whichever iPhone is unlocked and being used, and the Dynamic Island shows a notification when the line moves between devices.
- The feature requires both iPhones to run iOS 27 and appears to need carrier support, with reports naming T-Mobile and Deutsche Telekom as likely early partners and rollout varying by operator.
- Beyond easier two‑phone use, analysts say a network‑level implementation could keep a companion phone reachable even when the main device is off, and the move highlights a capability Android currently lacks and may push carriers to offer new multi‑SIM services.