Samsung Galaxy S21 Series

The Samsung Galaxy S21, S21+, S21 Ultra, and S21 FE all support eSIM alongside a physical nano-SIM slot. Released in January 2021 (S21 FE in January 2022), these models support one active eSIM at a time.

Key Takeaways

• All Galaxy S21 models support eSIM alongside a physical nano-SIM.
• One active eSIM at a time (not Dual eSIM).
• Physical SIM slot is present — not eSIM-only.
• Device must be carrier-unlocked for third-party eSIMs.

Does the Galaxy S21 Support eSIM?

Yes. All Galaxy S21 models support eSIM. One active eSIM runs alongside the physical nano-SIM at any time. Dual eSIM (two simultaneous active eSIM lines) is not available on S21 — that feature arrived with the S23 series.

Regional note: eSIM availability varies by carrier variant. Unlocked Galaxy S21 models (from Samsung.com) have the broadest eSIM compatibility.

Galaxy S21 Models and eSIM Compatibility

How to Activate eSIM on Galaxy S21

1. Open Settings.
2. Tap Connections, then SIM Card Manager.
3. Tap Add Mobile Plan.
4. Select Scan Carrier QR Code and point your camera at the Roamix QR code.
5. Tap Confirm and wait for the eSIM to install.
6. In SIM Card Manager, set the Roamix eSIM as your preferred data SIM.

Using Two Lines on Galaxy S21

Galaxy S21 supports one active eSIM alongside the physical nano-SIM. For travel:

• Physical SIM (home carrier): Calls and texts. Data disabled.
• Roamix eSIM: Preferred data SIM. Data Roaming on.

Manage your SIMs at Settings → Connections → SIM Card Manager.

Galaxy S21 eSIM for International Travel

Roamix works with any unlocked Galaxy S21. Purchase a plan, scan the QR code, and your Samsung connects to local networks when you arrive.

Carrier lock check: Settings → General Management → Device Information → IMEI status. Contact your carrier to request an unlock.

Galaxy S21 eSIM Troubleshooting

"Add Mobile Plan" missing on S21 FE: If you purchased an S21 FE in India or certain Southeast Asian markets, your variant may not include eSIM hardware. Check your model number at Settings → About phone. Indian S21 FE variants commonly omit eSIM. US and European variants (SM-G990B/DS) do include eSIM.

"Add Mobile Plan" missing on S21/S21+/S21 Ultra: Check if your device is a Chinese mainland variant — those models have no eSIM hardware. Otherwise, carrier lock is the most likely cause. Contact your carrier to unlock.

eSIM installed but no signal abroad: Confirm Roamix is set as the preferred data SIM in SIM Card Manager. Enable Data Roaming for the Roamix SIM. Toggle Airplane Mode on/off.

How to delete eSIM on Galaxy S21: Settings → Connections → SIM Card Manager → tap the eSIM → Delete eSIM. This is permanent — save a new QR code before deleting if you plan to reinstall.