The new iPhone Handoff capability, built into iOS 27, allows a subscriber to move an active cellular connection from one iPhone to another without changing the SIM or losing service, effectively enabling two devices to share a single phone number.
T‑Mobile has been the first U.S. carrier to roll out the service, charging a monthly fee of $5. Deutsche Telekom follows in Europe, offering iPhone Handoff for €6.95 per month on plans that do not already include multi‑SIM functionality.
Apple has indicated that Verizon and EE will add support later in the year, but AT&T’s response was more cautious. A spokesperson told CNET that AT&T “sees potential” in iPhone Handoff yet remains focused on its existing eSIM activation and transfer options, suggesting no immediate rollout is planned.
The feature is enabled through the iPhone Settings app and is ready to use from day one on the new iPhone 18 Pro lineup and the iPhone Duo, according to T‑Mobile. Users simply toggle the option and can then hand off calls and data between the two devices.
iOS 27’s launch on September 14 marks Apple’s push toward greater device continuity. Carrier pricing and the varying pace of adoption—especially AT&T’s non‑committal stance—could shape how quickly consumers embrace the dual‑device model.