iOS 27 introduces iPhone Handoff for seamless cellular connectivity between two devices

The iPhone Handoff feature in iOS 27 allows users to seamlessly transfer cellular connectivity between two iPhones. By configuring the feature in the cellular settings, users can designate a primary and secondary device, enabling the active phone to switch cellular service automatically when unlocked. This process involves setting up an eSIM on the secondary device, which links the phone number to both handsets. The transition is nearly instantaneous, allowing users to make and receive calls on whichever device is currently active. While the feature is designed for convenience, it requires a carrier that supports the service and involves a monthly fee. Additionally, third-party apps may require re-authentication or syncing time when switching devices, and security protocols may necessitate re-approving access on the primary device. Apple Pay and car keys must be configured individually on each device, and the feature is currently limited to two phones. To disable the feature, users must contact their carrier to stop the billing or delete the eSIM from the device settings.

iPhone Handoff enables seamless switching of cellular connectivity between two iPhones by automatically transferring the active status. The feature requires setting up an eSIM on the secondary device to link the phone number to both handsets.

Users can designate a primary and secondary device within the cellular settings to manage the handoff process. Third-party apps may require re-authentication or syncing time when switching between devices for security reasons.

Apple Pay and car keys must be configured individually on each device as they do not automatically sync across the handoff. The feature is limited to two devices and requires a carrier that supports the service for a monthly fee.