How to move your eSIM to iPhone Duo

iPhone Duo has no SIM card slot, so moving your phone number to it always means moving to an eSIM. If your current iPhone already uses an eSIM, this is a short job. If it still uses a plastic nano-SIM, the same process converts it on the way over.

This guide covers your phone number only. For your apps, photos and settings, see how to transfer from another iPhone.

Why iPhone Duo is eSIM-only

Apple's iPhone Duo spec page says the phone "is activated with an eSIM and does not support a physical SIM." Apple's Singapore store page adds that iPhone Duo has no physical SIM tray at all, and Apple's eSIM setup document names iPhone Duo among the models that support eSIM in China mainland.

It appears there is no SIM-tray version of iPhone Duo in any market, though Apple hasn't published a single worldwide statement, so check your country's Apple store page if you're buying abroad. More on the hardware in the full iPhone Duo specifications.

What you need before you start

Apple's eSIM Quick Transfer moves a number straight from your old iPhone to the new one. Apple lists these requirements:

• Both iPhones signed in to the same Apple Account.
• The old iPhone unlocked with its passcode, close by, with Bluetooth on.
• Both iPhones on iOS 18.4 or later.
• Wi-Fi or a hotspot for iPhone Duo (Apple says eSIM-only iPhones can activate without Wi-Fi in some countries and regions).
• A carrier that supports eSIM.

Switching carriers at the same time? The phone needs to be unlocked. As of Oct 31, 2026, Verizon's eSIM activation page says a device must be unlocked from any other carrier, and T-Mobile's Apple eSIM troubleshooting page says an iPhone not bought from T-Mobile must be unlocked.

Two more things to know. Apple says that with iOS 26 or later you can transfer more than one number. And the plan on the new iPhone deactivates your old SIM when it activates, so your old iPhone loses that number's cellular service once the plan activates on iPhone Duo.

Carrier by carrier (US, as of Oct 31, 2026)

Apple's built-in transfer is the same on every carrier, but each of the big three also documents its own route. Here's what their support pages say as of Oct 31, 2026.

Table built by iPhoneDuoGuide from the carrier support pages linked below, checked Oct 31, 2026.

Verizon

Verizon's My Verizon app eSIM FAQ says the app can move an existing number to another eSIM phone, or switch a physical SIM to an eSIM, without scanning a QR code. It's limited to standard monthly plans, and only the Account Owner or an Account Manager can do it. If the account has just one line, Verizon says you'll need the old phone to authenticate, and the move is free. Verizon's eSIM pages don't name Apple's Quick Transfer, and its activation page says those instructions don't cover Prepaid or Business plans.

AT&T

AT&T's iPhone eSIM transfer guide, written for iPhone 14, walks through Settings, Cellular and Transfer From Nearby iPhone, with a verification code entered on the old phone. AT&T's device-swap article, which shows an Aug 26, 2026 update date, also offers a web route through its Bring your own device page, which needs a one-time PIN, and it says Wireless Account Lock blocks SIM changes. Prepaid customers have to call AT&T at 800.901.9878 from another phone.

T-Mobile

T-Mobile's eSIM support page says new iPhones may offer to transfer an eSIM from an existing iPhone during setup, and that you can activate one later from Settings, Cellular. T-Mobile's general eSIM steps use the T-Life app as the fallback: open the Account tab, pick the line, choose SIM transfer or activation, and enter the IMEI and EID. T-Mobile says to turn off SIM Protection first.

Smaller carriers and MVNOs

Apple's only carrier requirement is eSIM support, so check your carrier's own help pages or app before setup day. Apple says carriers can also activate an eSIM through eSIM Carrier Activation, a QR code, a carrier link or the carrier's app.

If Quick Transfer isn't offered

Apple's eSIM setup document lists the alternatives. During setup, tap Use QR code on the Set Up Cellular screen. After setup, scan the carrier's QR code with the Camera app and tap Cellular Plan Detected, or tap the Carrier Cellular Plan Ready to Be Installed notification if your carrier assigned an eSIM. Manual entry lives at Settings, Cellular, Add Cellular Plan, Enter Details Manually.

Coming from Android? Apple's Android-to-iPhone eSIM document says a direct transfer needs iOS 26 or later and Android 16 or later, and, as of Oct 31, 2026, it lists AT&T, T-Mobile and Verizon among supported US carriers.

How many eSIMs iPhone Duo holds

Apple's spec page lists Dual eSIM, with two active eSIMs and storage for eight or more. As of Oct 31, 2026, T-Mobile's troubleshooting page puts the iPhone ceiling at 10 eSIM profiles, which fits inside Apple's eight-or-more figure. In practice, that likely means a personal line and a work or travel line can run side by side, with spares stored and switched off.

If it doesn't work

Apple's eSIM troubleshooting document suggests three steps in order: turn Airplane Mode on and off, turn the line off and back on in Settings, Cellular, then restart. After each one, check Control Center for your carrier's name.

Apple also suggests the Apple Support app's diagnostics on iOS 18 or later, and checking for a carrier settings update in Settings, General, About. Apple's eSIM setup document adds that if a banner reading Finish Setting Up Your Carrier's Cellular Plan appears, you can tap it to finish on your carrier's website.

Still stuck? Contact your carrier. Apple says to have the error message on screen, your phone number, your account password or PIN, and the IMEI or EID from Settings, General, About ready. Apple's document doesn't list specific error messages, so the carrier is the place to decode one. Broader help lives in the support section.

Bottom line

Apple's setup flow should move the number with a tap on the old iPhone for most postpaid customers whose carrier supports eSIM, physical SIM or not. As of Oct 31, 2026, AT&T and T-Mobile document that iPhone-to-iPhone route, while Verizon's support pages checked on Oct 31 don't mention it, so the My Verizon app is Verizon's documented route. It's not friction-free for everyone, though: on those carrier pages, prepaid, business and locked phones have extra steps. Once it's done, the rest of setup is in our new iPhone Duo setup guide. Did your carrier's transfer go smoothly?