Two devices running iOS 27 or later that are:
Connected to Wi-Fi
Sharing the same Apple Account
Using Messages in iCloud to ensure messages sync
Signed into FaceTime and iMessage with the same Apple Account
An eSIM from a carrier that supports iPhone Handoff:
USA: T-Mobile
Germany: Telekom
Dang, I had other ideas!
What you need:
Two devices running iOS 27 or later that are: Connected to Wi-Fi Sharing the same Apple Account Using Messages in iCloud to ensure messages sync Signed into FaceTime and iMessage with the same Apple Account An eSIM from a carrier that supports iPhone Handoff: USA: T-Mobile Germany: Telekom