T-Mobile adds monthly fee for dual iPhone number sharing
A new iOS feature lets one number live on two iPhones, but T-Mobile users must pay a recurring fee to use it.
Apple is introducing a feature called iPhone Handoff in iOS 27, which allows a single phone number to be shared across two different iPhone devices. While the technology is built into the operating system, its practical use depends on carrier support. T-Mobile has announced that it will charge customers five dollars per month to access this capability, marking a shift in how dual-device number sharing is monetized.
The feature is designed for users who want the flexibility of carrying two phones without needing two separate plans. According to reports from MacRumors, this functionality will be available at launch only to T-Mobile customers in the United States and Deutsche Telekom users in Germany. For everyone else, the option remains locked out until their carrier chooses to support the underlying e-SIM infrastructure.
How the number switching works
When enabled, one iPhone acts as the primary device while the other serves as a secondary. The system automatically switches the active number to whichever phone you unlock first. This means calls, texts, and mobile data will function on the device currently in your hand, while the other remains inactive but ready to take over. The transition is seamless and requires no manual switching within the settings menu each time you pick up a phone.
For the feature to work, both devices must be running iOS 27 or later, connected to Wi-Fi, and signed into the same Apple Account. Users must also have FaceTime, iMessage, and Messages in iCloud turned on. The setup can be initiated when activating a new iPhone or later through the Settings app, provided the carrier supports the service.
Limitations and device compatibility
Despite the convenience, there are notable restrictions. A phone number can only be active on one iPhone at a time, so you cannot make a call on one phone and receive a text on the other simultaneously. While payment cards and car keys in the Apple Wallet can work across both devices, other items like transit passes, IDs, or corporate badges may remain locked to a single phone. Additionally, the feature does not allow you to transfer an Apple Watch from one iPhone to another.
Users with dual SIM configurations can still use iPhone Handoff, but only if both e-SIMs are from carriers that support the feature. Each e-SIM must be set up separately, and both will switch simultaneously when you unlock the phone. Once activated, the feature remains on until you contact your carrier to disable it.
The cost of flexibility
The primary trade-off for consumers is the recurring monthly fee. T-Mobile’s five-dollar charge applies to anyone using the service, effectively turning a standard OS feature into a paid add-on. This contrasts with the expectation that such system-level functionalities are included in the base plan. The decision to monetize this specific carrier-supported feature highlights the complex relationship between Apple’s hardware ecosystem and carrier-specific service tiers.
iOS 27 is scheduled to launch on Monday, September 14, with the new iPhone 18 Pro models arriving on Friday, September 18. As users prepare to upgrade their devices, the availability of iPhone Handoff will depend entirely on their carrier and region, making the T-Mobile fee a significant factor for those in the US market.
