iPhone Handoff will seamlessly share one number between two phones

When iOS 27 is released later this month, it will include a feature called iPhone Handoff, which allows a single phone number to be shared between two iPhones. The feature is aimed at users who want to switch between devices without changing their primary contact number. First briefly mentioned during the June WWDC keynote, Handoff has now been shown in a setup demonstration within Xcode 27's Device Hub. In the demo, users can pair two iPhones, designating one as the main device and the other as a "companion" unit.

The introduction of Handoff appears timed with the anticipated launch of Apple's foldable iPhone Ultra. Because that device is expected to be bulky and expensive, some customers may prefer not to carry it at all times. Handoff would allow those users to temporarily shift their active number to a smaller, more affordable handset, such as an older iPhone. This provides a practical solution for people who want a premium device but also need a more portable option for daily use.

Carrier participation will be necessary for Handoff to function. Code references to T-Mobile US and Telekom.de were discovered in the software, but there is no confirmed information about which other carriers will support the feature. This means that availability may depend on individual wireless providers in the United States and elsewhere. The lack of detail beyond those two carriers leaves open questions about the broader rollout.

For American consumers, the T-Mobile US link suggests that at least one major domestic carrier is preparing for the feature. However, users on other networks may not have access at launch or may need to wait for their carrier to enable compatibility. The feature’s reliance on carrier infrastructure highlights a difference from purely software-based solutions, as the handoff of a phone number requires network-side coordination.

The broader context includes Apple’s expected September 9th launch event, which will likely showcase new hardware and software. Handoff’s arrival alongside iOS 27 positions it as part of a larger ecosystem update. The foldable iPhone Ultra, if announced, would give the feature a clear purpose, but Apple has not officially detailed its specifications or release timing. As the software lands, more specifics about carrier support and device pairing are expected to emerge.

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