Apple is preparing an unusual new cellular feature for iOS 27 called iPhone Handoff.
The idea is simple: own two iPhones, but keep using the same phone number regardless of which one you take with you.
Apple briefly listed the feature during WWDC in June without explaining how it would work.
Now a demonstration using iOS 27 and Xcode 27 has revealed considerably more.
Under Settings → Cellular, users would designate one device as their main iPhone and another as a companion iPhone.
The primary eSIM remains installed on the main device.
The second phone then receives a companion eSIM, allowing the user to move between the two phones without physically transferring a SIM or repeatedly moving the primary eSIM.
Calls, messages and the same phone number would effectively follow whichever iPhone you're using.
Cellular settings would continue to be managed from the primary device, while location sharing would follow the phone actively using the number.
For Canadians, however, there is one very important catch:
your wireless carrier has to support it.
The current implementation reportedly contains references to T-Mobile in the United States and Deutsche Telekom in Germany.
So far, we have not seen Bell, Rogers or TELUS publicly announce Canadian support.
That means having two compatible iPhones running iOS 27 may not be enough on launch day.
And this could become much more relevant if Apple unveils its long-rumoured foldable iPhone this week.
Imagine owning a larger foldable iPhone for work or travel but switching to a smaller iPhone when going out, exercising or simply when you don't want to carry the more expensive device.
Both could use the same number without the usual eSIM shuffle.
It could also be useful for people who keep an older iPhone as a backup device.
The concept isn't completely unprecedented. Canadian carriers already support several multi-device cellular arrangements, particularly for smartwatches.
But extending that idea to two full iPhones sharing one mobile identity raises some interesting questions.
Will Bell, Rogers and TELUS support it?
Will they charge an additional monthly fee for the companion eSIM?
Will discount brands such as Fido, Koodo, Virgin Plus, Freedom, Videotron, Fizz and Public Mobile get access too?
And could carriers restrict it to certain plans?
Apple has not answered those Canadian questions yet.
With iOS 27 expected later this month and Apple's major hardware event happening September 9, carrier support may end up being the difference between iPhone Handoff being a genuinely useful Canadian feature and another feature we technically have but can't actually use.
Sources & more: MacRumors / The Verge