Do the compatibility check first
An eSIM move can look like a simple phone setup step, but the cellular plan depends on several parties: the phone, its carrier, the country or region, and the network account. Check the exact model of the replacement phone, not only its product family. Some regional versions have different SIM hardware, and an eSIM-only model may not be sold or activated in the same way everywhere.
An eSIM profile is carrier provisioning data stored on supported hardware, not a file you can copy like a photo. Our hardware and software overview explains that distinction. Next, ask the carrier whether it supports eSIM transfer between your old and new devices. Apple says Quick Transfer requires carrier support, while Google notes that Pixel transfer behavior varies by carrier. A carrier may instead require a new activation, a QR code, an account verification step, or its own app. A transfer is not the same as cancelling a line. If the provider treats the request as a replacement or activation, ask what happens to the old plan before approving anything.
Check the phone and the network
Confirm that the new phone supports the carrier's bands and activation method in your country or region. Also check whether it is network locked. A phone can have eSIM hardware yet reject a plan from another carrier because the device is locked. Apple explains that using two carriers generally requires an unlocked iPhone, unless both plans use the same carrier. Corporate and family plans may have additional administrator rules.
Keep the old phone active, charged, and nearby. For Apple's Quick Transfer, both devices need to be signed in to the relevant Apple Account, the old phone must be unlocked, Bluetooth must be on, and the devices need supported software. Google's automatic Pixel transfer requires Android 12 or later, current Google Play Services, and a screen lock on both devices. Those requirements are platform-specific examples, not a universal promise for every Android model or carrier.
Prepare a reliable activation path
Connect the new phone to dependable Wi-Fi before starting. Apple lists Wi-Fi or a hotspot as part of normal eSIM setup, although some eSIM-only iPhones in certain countries and regions can activate without it. Do not rely on that exception when preparing for a phone replacement. Have your carrier login, account PIN, identity verification method, and any QR code available on a second screen. If the carrier sends a one-time code by text, make sure you know how it will reach you during the handoff.
Start the transfer on the new phone and wait for the activation result. Do not delete the eSIM profile from the old phone just because the new phone displays a setup screen. The old line may remain useful if the transfer fails, and deleting it can remove a fallback while you are still trying to contact the carrier. Apple says the previous SIM is deactivated when the new plan activates, while Google says an existing device or eSIM can still work when an automatic transfer is unsuccessful. These are useful safeguards, but the exact outcome remains carrier-dependent.
Test before wiping the old phone
On the replacement phone, check the carrier name and signal, place a call, send a text, and test mobile data with Wi-Fi temporarily off. If you use two lines, test the correct default number for calls and data. Also verify voicemail, two-factor authentication messages, and any carrier features that matter to you. A signal icon alone does not prove that calls, texts, and data all work.
Only after those checks pass should you remove the old eSIM, reset the old phone, or hand it to someone else. If activation stalls, stop repeated attempts and contact the carrier. Ask whether the line is active, whether the old profile was deactivated, and whether a replacement QR code or manual activation is needed. The goal is tested service on the replacement phone, not merely a successful-looking setup screen.
Sources
Apple: Set up eSIM on iPhone; Google Pixel Help: Transfer a SIM to a new phone; Apple: Using Dual SIM with an eSIM.