Samsung Galaxy S21 Ultra eSIM Compatibility

The Samsung Galaxy S21 Ultra is a Samsung Galaxy smartphone with built-in eSIM support. part of Samsung's Galaxy lineup with full Google Services support.

Samsung's eSIM implementation integrates smoothly with One UI, Samsung's Android skin. The SIM Manager in Settings gives you a clear overview of all installed SIMs, their status, and which is the default for calls and data. Samsung also supports eSIM transfer between Galaxy devices on One UI 5.0+, meaning you can move your eSIM profile to a new Galaxy phone without contacting your carrier.

DevRoute can automatically detect if a visitor is using Samsung Galaxy S21 Ultra and trigger eSIM-compatible flows instantly — no manual selection required.

1. Get your eSIM QR code or activation code from your carrier — most carriers send it via email, app, or SMS the moment you purchase a plan
2. On your Samsung device, open Settings and go to Connections (or Network & Internet on newer One UI versions)
3. Tap SIM Manager or SIM & Network
4. Select Add eSIM and then Scan QR Code
5. Point your camera at the QR code. If the QR code is damaged or won't scan, tap Enter Manually and type in the SM-DP+ address and activation code
6. Label your new line (e.g., "Travel" or "Work") and assign it as your default for calls, messages, or data

Samsung Galaxy devices with eSIM support include the S20 series and later, Z Fold and Z Flip foldables, and select A-series models. Note that carrier-locked variants may only accept eSIM from the original carrier.

If you have a Samsung Galaxy bought from a carrier (AT&T, Verizon, T-Mobile), it may be carrier-lock restricted and won't accept eSIM plans from other carriers. Unlocked international models (sold directly by Samsung) work with any GSMA-compliant carrier.

Using eSIM on your Samsung Galaxy while traveling internationally eliminates one of the biggest pain points of overseas travel: finding and activating a local SIM card. With eSIM, you can purchase a plan from Airalo, Holafly, or Nomad before you leave and have it active the moment you land.

Samsung's implementation supports the full GSMA eSIM specification, so most global carriers' QR codes work directly with the native camera QR scanner. Some Samsung devices also support SmartThings carrier integration on select carriers, letting you browse and activate plans directly from the SmartThings app.

Pro tip: Before traveling, download your eSIM plan while you're still on WiFi at home. Most eSIM providers give you a QR code that stays in your account until you're ready to activate it.

The Samsung Galaxy S21 Ultra is compatible with eSIM plans from AT&T, Verizon, T-Mobile, and most international carriers including Vodafone, Orange, Three, and carrier-specific MVNOs. Samsung's eSIM follows the GSMA RSP specification, which is the industry standard ensuring broad global carrier compatibility.