From CNET: The new iPhone Handoff feature in iOS 27 is a clever idea: If you have two iPhones, you can use either one with a single phone number — the system automatically activates your number on whichever phone is unlocked. And like Apple’s Handoff to Mac and iPad, your texts, calls, voicemails and Find My location follow you, too.
At launch, however, the feature is supported only by T-Mobile in the US, and the carrier is charging $5 a month to use it. And while Verizon support is expected by the end of the year, according to Apple, AT&T appears to be sitting this feature out for now.
iPhone Handoff is similar to what the Apple Watch has done with data for a few generations, where taking off one watch and putting on another automatically switches all of your information, such as activity tracking, to it. For example, some people use one watch during the day — perhaps the rugged Apple Watch Ultra — and switch to a slimmer, older Apple Watch at night, allowing the first to charge for the morning.
But replicating that behavior to the iPhone requires coordination with cellular providers. Each phone’s eSIM needs to be configured for iPhone Handoff by a carrier, and service needs to switch cleanly on the network side.
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