The basics
An eSIM (embedded SIM) is a digital SIM card built into your phone. Instead of inserting a small plastic chip, you download a carrier profile directly onto your device. It works exactly like a traditional SIM card — same calls, same data, same networks — but without the physical card.
The 'e' stands for embedded: the SIM hardware is already inside your phone. All you need is a digital profile to activate it, which typically comes as a QR code you scan with your camera.
eSIM vs Physical SIM
| Feature | Physical SIM | eSIM |
|---|---|---|
| Format | Plastic card (nano/micro) | Digital profile |
| Installation | Eject tray, insert card | Scan QR code |
| Switch carrier | Swap physical card | Download new profile |
| Multiple plans | Need multiple cards | Store several profiles |
| Delivery | Shipping or store pickup | Instant digital delivery |
| Risk of loss | Can be lost or damaged | Permanently embedded |
Why eSIMs are perfect for travelers
For international travelers, eSIM technology eliminates the biggest pain points of staying connected abroad. You can purchase a local data plan before you board your flight, activate it the moment you land, and avoid roaming charges entirely.
With Telcomia, you can compare plans across 200+ countries, purchase instantly, and start using data within minutes. Your regular phone number stays active on your primary SIM while the eSIM handles your travel data.
How does an eSIM work?
- 1
Purchase a plan — Choose a data plan for your destination through Telcomia.
- 2
Receive your QR code — After purchase, you'll get a QR code via email or in your account.
- 3
Scan and install — Open your phone's eSIM settings and scan the QR code. The carrier profile downloads automatically.
- 4
Activate and connect — Enable the eSIM in your phone settings. Your device connects to a local network.
The entire process takes 2–5 minutes and requires a Wi-Fi connection for the initial setup.
Frequently asked questions
Is my phone eSIM compatible?
Most smartphones released after 2019 support eSIM: iPhone XS and newer, Samsung Galaxy S20 and newer, Google Pixel 3 and newer. Check our compatible devices page for the full list.
Can I use eSIM and my regular SIM at the same time?
Yes. Most modern phones support Dual SIM — your regular SIM stays active for calls and texts, while the eSIM provides data.
Does eSIM support 5G?
Yes. eSIM supports 4G LTE and 5G, depending on the carrier and your device.
Can I use the same eSIM in another device?
An eSIM profile can be transferred to a new device, but must first be removed from the original. The QR code can typically be scanned up to 5 times.
Will my eSIM data be capped?
Yes. Telcomia's plans are prepaid with fixed data allowances. When your data runs out, the connection stops — no surprise charges.
Do I need internet to install an eSIM?
Yes. You need a Wi-Fi or existing mobile data connection to download the eSIM profile during initial setup.
Can I make phone calls with the eSIM?
Telcomia eSIMs are data-only. You can make calls using apps like WhatsApp, Skype, or FaceTime. Your regular phone line stays active for traditional calls.