Basics · 5 min read · 2 June 2026
What is an eSIM — and why travelers are switching
The plastic SIM's days are numbered. Here's how the embedded SIM works, why it's perfect for travel, and what you need before you try one.
An eSIM (embedded SIM) is a programmable chip soldered inside your phone. Instead of pushing a plastic card into a tray, you scan a QR code and a carrier profile installs itself in about two minutes. Your phone can hold several of these profiles at once — your home line stays exactly where it is, and a travel data plan slots in next to it.
Why it changed travel connectivity
Before eSIMs, staying connected abroad meant either painful roaming bills or hunting for a SIM kiosk after a long-haul flight, passport in hand. With an eSIM you buy a local data plan online before you fly, install it from your sofa, and it activates the moment your plane lands and the phone touches a local network.
- No physical swap — your home SIM stays in, so you never lose your number.
- Prepaid and capped: there is nothing that can bill you afterwards.
- Instant delivery: the QR code arrives by email seconds after payment.
- One phone can store multiple travel profiles for multi-country trips.
What you need
Two things: an eSIM-capable phone (iPhone XS or newer, Samsung S20+, Pixel 4+, and most recent flagships) and a carrier-unlocked device. Dial *#06# — if you see an EID number, your phone has the hardware. Check our device compatibility page for the full list.
The one rule everyone should know
Validity starts when the eSIM first connects to a network at your destination — not when you buy or install it. That means you can (and should) buy your eSIM days or weeks before the trip. Install at home on Wi-Fi, land, and go online in the taxi queue.