Keeping one phone number while alternating between two iPhones is becoming a carrier-priced convenience, not simply a setting to switch on. The choice now involves different advertised monthly charges, as well as a distinction between a service already offered and one still described as coming soon.
Verizon says iPhone Handoff will cost $10 a month on compatible iPhones running iOS 27 in its October 16 announcement. The carrier included the feature in its iPhone Duo coverage, but labelled Handoff as coming soon. The announcement does not establish a specific Handoff activation date.
T-Mobile advertises the feature at $5 a month, plus taxes and fees, on its service page. Its page says availability began September 14 on iOS 27. Those are different rollout positions, not evidence that both carriers currently offer an immediately activatable service.
Verizon’s announced monthly amount is twice T-Mobile’s advertised base rate. If unchanged for 12 months, the amounts work out to $120 and $60 respectively, a $60 difference before any additional applicable charges. That compares the Handoff amounts, not the full cost of either carrier’s mobile plan, device financing or other services.
Apple explains that only one iPhone is active on the shared number at a time in its setup guide. Unlocking the phone a customer wants to use makes the number active there. Calls, voicemail, messages and Find My location move to that device. This is not a promise of two simultaneously active cellular phones sharing a number.
T-Mobile’s secondary-phone service is not simply a duplicate of every primary-plan entitlement. Its FAQ specifies unlimited US calls, messaging and data with 50GB of premium data and unlimited mobile hotspot at 3G speeds. It also says launch support is limited to one active number/eSIM. Those are T-Mobile’s published conditions, not verified terms for Verizon’s forthcoming offering.
The distinction from cross-device task continuity matters: this service switches cellular reachability, rather than merely resuming an app on another screen. Apple says third-party applications still follow their own syncing rules, and an Apple Watch does not automatically move its pairing to the other iPhone. The carrier feature does not make every connected app and accessory interchangeable.
There is a billing consequence after setup, too. Apple says customers must contact their carrier to turn off iPhone Handoff. Deleting an eSIM may leave carrier charges running until cancellation is requested. Removing the cellular profile from a phone is therefore not confirmation that the monthly service has been cancelled.
