For years, people who keep two iPhones have dealt with the same headache. You either pay for a second line, or you go through the hassle of moving your eSIM every time you want to switch devices. Apple has finally made that process simpler.
With iOS 27, Apple introduced a feature called iPhone Handoff. It lets you use the same phone number on two iPhones. Unlock one, and the number becomes active on that phone. Unlock the other, and it switches. Calls, texts, voicemail, and your Find My location follow the phone you’re using.
When It Launched
iOS 27 rolled out in mid-September 2026. iPhone Handoff arrived with it. Apple first mentioned the feature briefly at WWDC in June, then filled in the details when the software shipped.
The feature is live now for people whose carriers support it.
How It Works
You designate one iPhone as the main device and the other as the companion. The main phone keeps the primary eSIM. The companion gets a companion eSIM tied to the same number. From that point on, the system detects which phone you unlock and activates the number there.
Only one phone is active for cellular service at a time. This is not the same as having two fully independent lines that both receive calls simultaneously. It’s a clean handoff between the two devices.
What moves with the switch:
- Incoming and outgoing calls
- Voicemail
- Messages (iMessage, RCS, SMS, MMS)
- Find My location
Some banking apps may ask you to re-approve access on the second phone. Certain Wallet items, such as IDs or transit passes, may stay tied to one device. Payment cards and car keys generally work across both.
What You Need
Both iPhones must be running iOS 27 or later. They also need to:
- Be signed into the same Apple Account
- Have Messages in iCloud turned on
- Be signed into FaceTime and iMessage with the same account
- Be connected to Wi-Fi during the initial setup
Once set up, the phones do not need to stay near each other for the switch to work.
Dual SIM is supported as long as both eSIMs come from carriers that support iPhone Handoff. In that case, both lines switch together when you unlock a phone.
Carrier Support and Cost
This is the biggest practical limit right now. Apple built the software, but carriers have to enable the companion eSIM on their end.
Current support:
- T-Mobile (United States) — available, with a $5 monthly fee
- Telekom (Germany)
Coming later this year
- Verizon (United States)
- EE (United Kingdom)
AT&T has not committed to supporting it so far.
If your carrier is not on the list yet, the feature will appear in Settings but you will not be able to activate it.
Who This Helps
This is useful for people who already own two iPhones — one for work and one for personal use, a smaller travel phone and a larger daily driver, or a new model they want to test alongside their current one. It removes the need to maintain two separate cellular plans or constantly transfer the eSIM.
It is not a replacement for true multi-device sharing on some carrier plans, where several devices can stay connected at once. iPhone Handoff keeps things simple: one active number that follows the phone you pick up.
The Bottom Line
iPhone Handoff is a practical improvement for dual-iPhone users. It launched with iOS 27 in September 2026 and works well once your carrier supports it. The experience is straightforward — unlock the phone you want to use, and the number moves with you.
Check with your carrier for availability and any extra monthly charge. If you’re already on T-Mobile or Telekom, you can set it up today. For everyone else, the feature is ready on the software side and waiting on broader carrier support.
Written with assistance from Grok, built by xAI