iOS 27: Revolutionizing Communication with Shared Phone Numbers on Two iPhones

Apple is set to introduce a unique feature called “iPhone Handoff” in the upcoming iOS 27. This feature will enable users to seamlessly switch between two iPhones while sharing a single phone number between them.

Although Apple has not officially announced this feature yet, it was briefly mentioned on a slide during the WWDC 2026 keynote. A recent post on MacRumors shared details provided by one of its forum members, along with a video demonstration using simulated devices in Apple’s Xcode development suite.

Understanding How iPhone Handoff Works

A new option called “iPhone Handoff” will be available in Settings > Cellular when the feature is active. This option will appear below “My Number” for each line that supports it. Selecting this option will display a brief explanation of how the feature works, with a “Learn More” link that currently leads to a non-existent support document, a common occurrence during iOS beta phases.

The feature does not allow two iPhones to share a single phone number simultaneously. Instead, it is active on the device being used and inactive on the other. Both iPhones must be on the same carrier network since they are sharing the same number and account.

It is unclear how this feature will interact with a second line provisioned using another eSIM. While technically feasible, the automatic handoff may depend on the setup of primary and secondary lines.

MacRumors also mentions that all cellular settings are managed on the main iPhone, and location sharing is based on the device actively using the phone number.

The companion iPhone will have its own eSIM provisioned with its unique IMEI and ICCID. The phone number will transition between the two eSIMs whenever a device is unlocked, providing a smoother experience compared to manually transferring the eSIM via carrier portals.

Carrier support is essential for this feature, currently limited to T-Mobile (US) and Deutsche Telekom. However, support may expand before the public release of iOS 27. T-Mobile beta testers can see the option but are unable to register, indicating that the carrier is not yet fully prepared.

This feature draws parallels to how cellular Apple Watch models operate. The Apple Watch was the first Apple device to adopt an eSIM in 2017, initially sharing a number with a paired iPhone. The introduction of Family Setup in 2020 allowed Apple Watch to have its unique phone number.

Carriers supporting cellular Apple Watch models may find it easier to adopt the iPhone Handoff feature, as they are built on similar principles. The industry awaits further developments.