iPhone Handoff in iOS 27: Use One Number on Two iPhones

iPhone Handoff in iOS 27 allows a single phone number to be shared between two enrolled iPhones, automatically switching cellular service between them. Only one device can be active on the network at a time, with the other device taking over the number when unlocked. This feature eliminates the need to transfer an eSIM repeatedly for users who switch between two personal iPhones frequently.

For iPhone Handoff to work, both iPhones must be running iOS 27 or later, share the same Apple ID, use Messages in iCloud, and be signed into FaceTime and iMessage with the same account. They also require Wi-Fi during setup and an eSIM from a participating carrier. At present, T-Mobile in the US and Telekom in Germany support iPhone Handoff.

Apple charges $5 per month for the feature in the US, while Telekom in Germany offers similar pricing. The setup process differs from Apple's usual eSIM transfer method. With iPhone Handoff, both phones remain enrolled, and the active device changes based on which one is unlocked. The main device handles Caller ID, Call Forwarding, and carrier account management, while the secondary device can use calls, texts, cellular data, mobile hotspot, Scam Shield, and T-Satellite on eligible plans.

When switching between iPhones, a "Switched to this iPhone" message appears. Users can enable Handoff during initial setup or afterward through Settings > Cellular > Set Up Cellular or Add eSIM. From there, they choose which phone serves as the main device and which becomes the secondary one. After setup, switching between devices is simple, with the active device indicated by a "Switched to this iPhone" message.

Other iCloud data syncs normally between both phones, but third-party apps may behave differently, depending on their individual designs.

Some limitations include Apple Watch not switching automatically when the phone number moves, Wallet credentials potentially remaining device-specific, and carrier settings tied to the main iPhone. For managed environments, the Apple ID requirement limits the feature's applicability. To use iPhone Handoff, customers should confirm their carrier's support for the feature and any associated monthly charges.