What Is an eSIM and How Does It Work?
What Is an eSIM?
An eSIM (embedded SIM) is a digital SIM that is built directly into your smartphone, tablet or smartwatch. Unlike a traditional SIM card, which is a small plastic chip you insert into a tray, an eSIM is soldered onto the device's motherboard at the factory. You activate it by downloading a network profile — usually by scanning a QR code or using your carrier's app.
Once activated, an eSIM works exactly like a physical SIM. You get the same calls, texts and data. The only difference is there is no plastic card to lose, damage or swap between devices.
How Does an eSIM Differ from a Physical SIM?
| Feature | Physical SIM | eSIM |
|---|---|---|
| Form factor | Removable nano/micro card | Chip built into the device |
| Activation | Insert card, restart phone | Scan QR code or use carrier app |
| Switching networks | Swap the card | Download a new profile |
| Dual SIM | Requires two SIM slots | One eSIM + one nano SIM slot |
| Risk of damage | Can be lost or broken | Cannot be removed or damaged separately |
Benefits of eSIM
- No physical card needed — activate your plan in minutes without waiting for a SIM to arrive in the post.
- Switch networks easily — download a new eSIM profile without visiting a store or ordering a replacement card.
- Dual SIM capability — run two numbers on one phone. Keep a personal and business line on the same device.
- Better for travel — add a local data eSIM when abroad without removing your UK SIM.
- More secure — an eSIM cannot be physically removed from a stolen phone, making SIM-swap fraud harder.
Which UK Networks Support eSIM?
| Network | eSIM Support |
|---|---|
| EE | Yes |
| Vodafone | Yes |
| O2 | Yes |
| Three | Yes |
| SMARTY | Yes |
| Sky Mobile | Yes |
| giffgaff | No (as of 2026) |
Which Phones Support eSIM?
- Apple — iPhone XS and later (including iPhone SE 2nd generation and newer)
- Samsung — Galaxy S20 and later, Galaxy Z Flip/Fold series
- Google — Pixel 3 and later
Check your phone's settings for an "Add eSIM" or "Add Mobile Plan" option to confirm compatibility.
eSIM for Business
For businesses managing multiple mobile devices, eSIM offers significant advantages:
- Faster provisioning — new starters can be connected in minutes rather than waiting for SIM cards to be shipped.
- Remote setup via MDM — IT teams can push eSIM profiles to devices using Mobile Device Management platforms, with no physical handling required.
- No shipping costs — eliminate the logistics of ordering, storing and distributing SIM cards across offices or remote workers.
- Easier device rotation — reassign eSIM profiles when employees change handsets or leave the company.
Managing SIM cards across a business fleet? Connection Technologies handles provisioning, eSIM setup and SIM swaps for your entire team. Get a free quote or call 0333 015 2615.
