Apple has added a new "iPhone Handoff" feature to iOS 27 that will allow you to switch between two iPhones while using the same phone number on each device.
This functionality was briefly mentioned during the WWDC 2026 keynote in June, on a slide that listed hundreds of new features coming in iOS 27 and corresponding software updates, but Apple never shared any further details at the time.
MacRumors forum member pdfu has since shared a video that demonstrates how the feature will work, using two simulated iPhones running in Xcode 27's Device Hub.
"iPhone Handoff" can be set up from the Settings app, under the Cellular menu. During the setup process, you can choose which iPhone you want to be the main device that you use most often and which one you want to be the companion device.
Apple says a user's main eSIM will remain on the main iPhone, while the companion iPhone will receive a companion eSIM, and this will enable you to switch between the devices back and forth while using the same phone number.
All cellular settings are managed on the main iPhone, and location sharing is based on whichever iPhone is actively using the phone number.
In addition to needing two iPhones running iOS 27, "iPhone Handoff" will seemingly require carrier support. The forum post mentions that T-Mobile in the U.S. and Deutsche Telekom in Germany might be among the first carriers to offer the feature.
Following three months of beta testing, iOS 27 is expected to be released later this month, so we will likely hear more about this feature soon.
