iPhone Handoff: Using One Number Across Two iPhones

Apple has introduced a new capability that allows users to operate two iPhones with a single phone number, eliminating the need for separate carrier accounts. The feature, called iPhone Handoff, debuted with iOS 27 and was unveiled at Apple's September 9 event. The setup process is intentionally straightforward: once configured, simply unlocking the iPhone you want to use activates it for calls, messages, and other services.

The feature enables several key functions across both devices. Users can make and receive calls and text messages on either phone using the same number, add payment cards that work on both devices, and access most apps and iCloud services seamlessly. However, there are notable limitations. Carrier support is required, and not all carriers have adopted the technology yet. Additionally, the feature does not switch a paired Apple Watch between devices, and certain wallet items such as identification cards and digital passes remain unavailable.

To set up iPhone Handoff, both devices must run iOS 27 or later, be connected to the same Wi-Fi network, and be signed into the same Apple Account for iCloud, FaceTime, and iMessage. One device functions as the primary phone, holding the main eSIM and managing carrier settings, though both phones can use their own eSIMs if both carriers support the feature. The setup process involves placing the two iPhones together, unlocking one, navigating to Settings > Cellular, and selecting the option to use the number on both devices. Users then follow on-screen instructions to designate which device serves as the primary phone.

Currently, carrier support remains limited. In the United States, only T-Mobile has confirmed compatibility, though the carrier charges an additional five dollars monthly for the service. Germany's Telekom has also announced support. Apple expects more carriers to adopt the feature in the future, but widespread availability has not yet materialized.

Using iPhone Handoff requires minimal effort. A small notification appears near the Wi-Fi indicator in the Dynamic Island to confirm the device is active for the feature. Beyond that, the technology operates invisibly in the background. While the feature targets a niche audience, several use cases exist. Users upgrading to a new iPhone can maintain their old device for travel or as a backup. Professionals managing separate work and personal devices can consolidate to a single phone number. Additionally, those wanting to carry a less expensive or more portable device alongside a premium model can do so without managing multiple numbers.

One important consideration: when replacing one of the iPhones, users must transfer the eSIM to the new device. To completely disable iPhone Handoff, Apple requires contacting your carrier directly. The feature represents Apple's push toward seamless multi-device experiences, though its practical utility depends heavily on carrier adoption and individual user needs.