T-Mobile iPhone Handoff Cost: What the Fee Covers

T-Mobile confirmed it will charge $5 per month for iPhone Handoff, the eSIM feature arriving with iOS 27 that lets one phone number move between two iPhones, according to a T-Mobile press release cited by The Verge (The Verge, 3 days ago; MacRumors, 3 days ago). If you're picturing two phones ringing at once on the same number, that's not what this buys. Only the selected iPhone can have the number active at a time, so Handoff works more like a switch than a two-line plan.

Think of it like a baton pass: one iPhone holds the number, and unlocking the other device hands it over automatically. Both phones can be set up with the same number, but only the selected iPhone can have it active at any given moment (MacRumors, 3 days ago).

Apple scheduled iOS 27 to launch today, September 14, with the new iPhone 18 Pro models following Friday, September 18 (MacRumors, 3 days ago). Apple's own support documentation stays vague on cost, noting only that "carrier fees might apply" and pointing customers to their carrier for specifics (9to5Mac, 4 days ago). T-Mobile is currently the only U.S. carrier offering the feature.

How much does T-Mobile iPhone Handoff cost?

The $5 charge covers the carrier-side service, not iOS 27 itself. T-Mobile's press release set the price at $5 a month, as reported by The Verge (The Verge, 3 days ago). Apple built the underlying software into iOS 27, but pricing and enrollment run through whichever carrier supports the feature, which is why Apple's support page tells customers to contact their carrier instead of listing a number (9to5Mac, 4 days ago).

Deutsche Telekom in Germany takes a different approach. It doesn't charge a standalone Handoff fee; the feature is included in the carrier's existing MultiSIM offering, which normally costs €6.95 a month when added to a plan, though some plans already include a MultiSIM slot at no extra charge (9to5Mac, 4 days ago).

Pricing isn't standardized the way a data overage fee might be. T-Mobile bills Handoff as its own $5 line item; Deutsche Telekom folded the same capability into a service it already sells. If Verizon and EE add support by the end of this year, nothing suggests either one will price it the way T-Mobile did. Treat the $5 figure as a T-Mobile-specific number, not an industry standard.

How T-Mobile iPhone Handoff works on two iPhones

Handoff uses eSIM technology to let a single phone number live on two separate iPhones. One device becomes the main iPhone and the other the secondary device sharing that number (MacRumors, 3 days ago). T-Mobile describes it as letting customers choose which of their two compatible iPhones is active at any given time (MacRumors, 3 days ago).

Switching doesn't require opening an app or flipping a setting. Unlocking either iPhone automatically shifts the active number to that device (MacRumors, 3 days ago). Someone who carries a personal iPhone during the day and a work iPhone in the evening could let the number follow whichever phone they pick up next, without re-registering anything.

On an eligible T-Mobile plan, calls, texts, data, mobile hotspot, Scam Shield, and T-Satellite all work on both iPhones (MacRumors, 3 days ago). The supplied reporting does not identify which T-Mobile plans qualify. Confirm eligibility with T-Mobile before enrolling.

What iOS 27 requires for Handoff to work

Getting two iPhones to share a number takes more than one toggle. Both devices need to meet several conditions before Handoff functions:

• Both iPhones must run iOS 27 or later (MacRumors, 3 days ago)
• Both need an active Wi-Fi connection during setup (MacRumors, 3 days ago)
• Both must be signed into the same Apple Account (MacRumors, 3 days ago)
• FaceTime, iMessage, and Messages in iCloud need to be turned on for both devices (MacRumors, 3 days ago)

Enrollment happens in one of two places: when activating a brand-new iPhone, or afterward through Settings (MacRumors, 3 days ago). That matters for anyone who already owns two iPhones and doesn't want to reset either one just to try the feature.

Turning it off works differently. Once Handoff is active, T-Mobile says you must contact the carrier to turn it off (MacRumors, 3 days ago). Enabling it can happen from Settings; disabling it apparently can't. Factor that in before treating this as a quick trial.

Who can use it right now, and what dual SIM setups need

Carrier support decides whether any of this is available at all, and right now the list is short. At launch, only T-Mobile customers in the U.S. and Deutsche Telekom customers in Germany can use iPhone Handoff (MacRumors, 3 days ago). Verizon and EE are expected to add support by the end of this year, with more carriers following after that (9to5Mac, 4 days ago).

For anyone running dual SIM setups, there's an added wrinkle. Both eSIMs involved have to belong to carriers that support Handoff, and each eSIM needs to be configured separately during setup (MacRumors, 3 days ago). Once both are set up, they don't switch independently: unlocking the iPhone shifts both eSIMs at the same time (MacRumors, 3 days ago). Anyone juggling a personal line and a work line on eSIM already should know Handoff moves both lines together rather than letting you switch one and leave the other put.

Who should pay for Handoff?

Based on the mechanics above, here's how the fee shakes out for different situations. This is editorial guidance drawn from the confirmed limitations, not a description of what T-Mobile promotes the feature for.

• Worth considering if you regularly switch between two compatible iPhones, a personal phone and a work phone, for example, and want one number reachable no matter which one you're carrying.
• A poor fit if you need both phones to ring or receive texts on that number at the same time. Handoff only ever activates the number on one device.
• Not a substitute for a second phone line, a dedicated work number, or a way to fully clone one iPhone's setup onto another. Wallet credentials and Apple Watch pairing don't come along for the ride.

What doesn't transfer: Wallet and Apple Watch limits

Handoff moves cellular service, but it doesn't turn two iPhones into a single identity. Wallet items split into two categories. Payment cards and car keys can work across both iPhones. Transit passes, IDs, and corporate badges are different: Apple warns those might only work on one of the two devices at a time (MacRumors, 3 days ago).

An Apple Watch is a separate limitation. Handoff does not transfer a Watch between the two iPhones (MacRumors, 3 days ago). That likely means anyone who wears an Apple Watch and expects it to follow the active phone should plan around the gap rather than assume it's covered.

None of this makes Handoff a full clone of an iPhone's identity, credentials, and paired accessories. It solves one specific problem: keeping a phone number reachable across two iPhones.

Before you enroll: what to verify first

Given the $5 monthly charge and a cancellation process that runs through the carrier rather than a Settings toggle, a few things are worth confirming before signing up:

• Check with T-Mobile support whether your specific plan supports Handoff, since eligibility hasn't been broken down by plan tier in reporting so far.
• Ask T-Mobile whether the $5 fee applies per line or per account. That's an unanswered billing detail, not something covered in current reporting.
• If you're running dual SIM, confirm both carriers involved support Handoff, not just one.
• Decide in advance whether you're comfortable with cancellation requiring a call to T-Mobile rather than a quick in-app change.

Skipping this step is how people end up paying for a feature that doesn't do what they expected, or discovering the cancellation process is more of a hassle than flipping a switch.

What to do next

T-Mobile's $5-a-month fee buys number-switching between two iPhones, not a second line. It requires iOS 27, matching Apple Accounts, a Wi-Fi setup process, and a supported plan. Right now, that combination exists only for T-Mobile customers in the U.S. and Deutsche Telekom customers in Germany, with Verizon and EE expected to join by the end of this year (9to5Mac, 4 days ago).

If you're a T-Mobile customer curious about trying it, confirm plan eligibility and billing details with T-Mobile before enrolling, and don't expect your Apple Watch or every Wallet credential to come along automatically. If you're on Verizon, EE, or another carrier, the supplied launch information doesn't identify support for your carrier yet. Watch for an official rollout announcement rather than assuming access once iOS 27 lands on your phone.