What is an eSIM and how does it work?
An eSIM is a SIM card built into your phone, so you don't have to swap a plastic chip. Instead of going to a store, you download a profile from an app or email — your phone connects to a mobile network using that profile, just like a physical SIM, but invisibly.
For travel, eSIMs solve three real problems:
- No swapping. Your home SIM stays in. The travel eSIM lives alongside it. You switch which one is active for data with a tap.
- No store visits. Buy and install before you fly. The eSIM activates the moment you connect to a network at your destination.
- No roaming bills. Travel eSIMs use local networks at local rates. Your home carrier doesn't bill you for the trip.
How does it work in practice?
When you buy a plan from esimple, we email you a QR code. On your phone, you scan the QR code and your device adds the eSIM to its list of cellular plans. You give it a label (e.g. "Spain trip"), pick when to use it for data, and that's it.
When you land at your destination, your phone registers on a local network and the plan's validity period begins. Data flows. You browse, message, hail rideshares — same internet as a local phone.
What it isn't
eSIMs are data plans, not phone-number plans. You don't get a local phone number to receive calls or SMS on. Your home number still works for calls and texts (subject to your home carrier's roaming charges if you don't disable voice/SMS roaming).
If you need a local number, you'd use a service like WhatsApp / Signal over the eSIM's data — same end result, no number swap needed.
Ready to try?
Pick a destination from our destinations page and grab a plan. Installation takes under a minute.