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.
"iPhone Handoff" can be set up from the Settings app, under the Cellular menu. Setup demo. 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 depending on which one is unlocked.
All cellular settings are managed on the main iPhone, and location sharing is based on whichever iPhone is actively using the phone number.
Your phone number will switch between the two iPhone devices depending on which one is unlocked. You'll see a Dynamic Island notification on unlock when iPhone Handoff transfers your service.
Some of the requirements for iPhone Handoff:
* Carrier compatibility (see below).
* Both devices need to be signed in with the same Apple Account, and updated to iOS 27.
* The main device needs to be locally available over Bluetooth LE to create the companion eSIM, similar to eSIM transfer today.
Carrier bundles for T-Mobile US and Deutsche Telekom in iOS 27 add support for the feature, according to https://redesmoveisfixas.com/carrier. However, T-Mobile's enrollment server currently returns a 'feature disabled' response, so enrollment is not possible. There are some reports that enrollment was available last month.