iPhone Handoff lets two iPhones share a single number

iOS 27 introduced iPhone Handoff, which lets two iPhones share one SIM and phone number by automatically moving the eSIM between devices, similar to a cellular Apple Watch. It is available only to T-Mobile customers in the U.S. and Telekom in Germany, with T-Mobile charging $5 per month; AT&T has no near-term plans to support it.

• iPhone Handoff automatically switches the eSIM between two iPhones, like a cellular Apple Watch
• Support is limited to T-Mobile in the U.S. and Telekom in Germany
• T-Mobile charges an extra $5 per month for the feature
• AT&T says it has no plans to support iPhone Handoff soon