Is the Samsung Galaxy S23 Ultra eSIM compatible?

Yes. The Samsung Galaxy S23 Ultra (2023) 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

Stores multiple eSIM profiles but one active eSIM at a time.

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 S23 Ultra 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 S23 Ultra 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 S23 Ultra supported on the ONSIM network? Yes

Whether a phone has eSIM and whether it works on a specific network are different questions. The Samsung Galaxy S23 Ultra is on the ONSIM supported device list, so it works on the ONSIM network. On this handset an ONSIM Landline eSIM is emailed instantly at checkout and is typically live within minutes.

Get an instant eSIM ONSIM supported devices →

ONSIM Landline eSIM: a UK landline number (01, 02, 03 or 08) on your Galaxy S23 Ultra, activation QR code emailed instantly at checkout, typically live in minutes. From £10/user/month + VAT.

Samsung Galaxy S23 Ultra eSIM questions

Does the Samsung Galaxy S23 Ultra support eSIM?

Yes. The Samsung Galaxy S23 Ultra (2023) supports eSIM in its UK version. Stores multiple eSIM profiles but one active eSIM at a time.

How do I check if my Samsung Galaxy S23 Ultra has eSIM?

Dial *#06# on the Galaxy S23 Ultra. 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 S23 Ultra?

No. The Galaxy S23 Ultra 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 S23 Ultra work with ONSIM?

Yes. The Samsung Galaxy S23 Ultra is on the ONSIM supported device list, so it works on the ONSIM network. On this handset an ONSIM Landline eSIM is emailed instantly at checkout and is typically live within minutes. See the supported devices page for the current list.

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