What is an eSIM, and how does a travel eSIM work?
What is inside the phone?
A small chip soldered to the board, called an eUICC, does the job a SIM card does. It stores one or more downloadable profiles, each one a line from a carrier. Apple calls it "an industry-standard digital SIM" and says an iPhone can hold eight or more eSIMs, with two active at once.
What do you get when you buy a travel eSIM?
A QR code, a link or an app flow that downloads a data-only profile. The seller is usually not the local network: most travel eSIM providers resell access to one or more local operators, and the plan page names them. You pay for an allowance (say 5 GB) and a validity window (say 7 days), whichever runs out first.
On 10 Nov 2026 we tracked 5,722 such plans from Airalo, Holafly, Nomad, Saily across 191 destinations. The median best price per GB across those destinations was $1.45.
Which phones can use one?
iPhone XS, XS Max, XR and later; Pixel 4 and later; and the Galaxy models on Samsung's list. Phones bought in some places are exceptions: most iPhones sold in China mainland have no eSIM. Check yours with our compatibility checker.
What does an eSIM not change?
- The phone still has to be free of a carrier lock to accept another carrier's profile.
- Your home number stays on your home SIM. WhatsApp and iMessage keep working on it over the eSIM's data.
- Speed depends on the local network the provider uses, not on the eSIM itself.
Next: install one on iPhone, on Android, or compare prices for your destination.
Questions
Is an eSIM the same as a physical SIM?
It does the same job. The profile is downloaded to a chip in the phone instead of being printed on a card.
Can I keep my home SIM while using a travel eSIM?
Yes, on phones with dual SIM support. Set the travel eSIM as the line for mobile data and leave the home line on for calls and texts.