Is the Samsung Galaxy S21+ eSIM compatible?

Yes. The Samsung Galaxy S21+ (2021) supports eSIM in its UK version.

Verified against the manufacturer and UK carrier sources. Data last updated 2026-07-23.

The detail and the caveats

UK Exynos model supports eSIM; US Snapdragon variants lacked it at launch.

Samsung pattern: All UK S-series flagships from the S20 (2020) onward have eSIM, but the S20 FE and S21 FE do not (FE models only gained eSIM from the S23 FE). All UK foldables from the Z Flip and Z Fold2 onward have eSIM; the original 2019 Galaxy Fold is unreliable. A-series eSIM arrived with the A54 (patchy) and became dependable from the A55, A35, A56 and A36; other UK A-series models have no eSIM. Two active eSIMs only on S25 and S26 generation flagships, 2025 and 2026 foldables and the Snapdragon S24 Ultra.

Dual eSIM: no, the Galaxy S21+ runs one active eSIM at a time (usually alongside the physical SIM).

Verify your exact unit in 10 seconds

Model level answers have limits, especially with grey imports and regional variants. To test the actual Galaxy S21+ in your hand:

  1. Open the dialler and dial *#06#.
  2. Look for an EID: a 32 digit number shown alongside the IMEI.
  3. EID present = the phone has eSIM hardware. No EID = no eSIM.

You can also check Settings > About phone for an EID entry.

A separate question

Is the Galaxy S21+ supported on the ONSIM network? It depends

Whether a phone has eSIM and whether it works on a specific network are different questions. The Samsung Galaxy S21+ may work on the ONSIM network, but it depends on the software it is running. Check it against the supported devices page before ordering: ONSIM cannot troubleshoot devices outside that list.

Check another phone ONSIM supported devices → Landline SIM →

Samsung Galaxy S21+ eSIM questions

Does the Samsung Galaxy S21+ support eSIM?

Yes. The Samsung Galaxy S21+ (2021) supports eSIM in its UK version. UK Exynos model supports eSIM; US Snapdragon variants lacked it at launch.

How do I check if my Samsung Galaxy S21+ has eSIM?

Dial *#06# on the Galaxy S21+. If an EID (a 32 digit number) appears alongside the IMEI, your unit has eSIM hardware; no EID means no eSIM. You can also open Settings > About phone and look for an EID entry. This checks your exact handset, which matters for grey imports and regional variants.

Can I use two eSIMs at once on the Samsung Galaxy S21+?

No. The Galaxy S21+ supports eSIM, but only one active eSIM at a time. You can still run two lines by pairing the eSIM with a physical SIM in the tray.

Does the Samsung Galaxy S21+ work with ONSIM?

Possibly. The Samsung Galaxy S21+ may work on the ONSIM network, but it depends on the software it is running. Check it against the supported devices page before ordering: ONSIM cannot troubleshoot devices outside that list. See the supported devices page.

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