iPhone tower · floor

How to set up eSIM on iPhone, and what your carrier decides

Apple documents five different ways to do this, and says plainly that which one applies is not up to you. That is the first thing to know about how to set up eSIM on iPhone, because it decides whether any given set of steps is yours to follow.

So the first useful step is not a setting. It is finding out which of those five your carrier supports — Apple maintains a list of carriers and worldwide service providers that offer eSIM, and links it from the same page. Starting there saves following steps that were never going to apply.

Apple’s own definition is worth having too, because the word suggests something smaller than it is: an eSIM is “an industry-standard digital SIM built into your iPhone, eliminating the need for a physical SIM card”, and a phone can “manage up to eight or more eSIMs”. It is not one slot made digital.

What has to be true before any of it. Apple lists what you need as an iPhone XS, XS Max, XR or later, a carrier that supports eSIM, and a Wi-Fi network or hotspot — with an exception: “In some countries and regions, iPhone models that are eSIM only can activate without a Wi-Fi network.” It also names two places where the rules differ: in China mainland only the iPhone 17e and iPhone Air support eSIM, and in Hong Kong and Macao certain models take two physical nano-SIM cards instead. Where you are is part of the answer.

The first route is the one that appears when a new phone comes out of its box. Apple: with eSIM Quick Transfer “you can transfer the SIM from your previous iPhone to your new iPhone without contacting them” — and, with some carriers, convert an existing physical SIM to an eSIM on the same phone.

If the transfer did not happen during setup, Apple gives the route afterwards: Settings → Cellular → Set Up Cellular or Add eSIM → choose a plan to transfer. And a specific instruction for the moment the screen is empty: “If you don’t see a list of numbers, tap Transfer From Nearby iPhone.” That is the button people miss, because a blank list reads as a failure rather than as a prompt.

One more thing that has changed recently enough to be worth stating with its version attached. Apple: “With iOS 26, you can transfer more than one phone number to your new iPhone.” On earlier software that is a one-at-a-time job, which matters to anybody moving a phone that carries two lines.

The floors below take it three ways: which route applies to you, what the transfer needs, and the neighbouring settings for a phone that has just changed hands or countries.

What this tower will not do

It will not give one procedure. Apple documents five and says the carrier decides which applies, so a single set of steps would be right for some readers and misleading for the rest.

It will not treat the transfer as a copy. Apple says activating the new plan deactivates the previous SIM, and that is worth knowing before rather than after.

And it will not skip the regional exceptions. Apple names places where the rules differ, and a page that ignored them would be wrong for the people living there. What holds instead is simple: the definition of an eSIM, the statement that the activation method depends on carrier support, the five documented routes, the requirements and the regional exceptions, the four Quick Transfer conditions, the Transfer From Nearby iPhone instruction, the note that activation deactivates the previous SIM and the iOS 26 multiple-number transfer are quoted from Apple’s support documentation, listed below.