What an eSIM is
An eSIM is a digital SIM built into a compatible phone. A travel eSIM gives you mobile data without removing your normal SIM card.
Practical guide
How travel eSIMs work
Understand how an eSIM is installed, when it starts and how to use it for mobile data. Use the checklist below to verify the key details.
Reading time4 minutesUpdated 21 July 2026
Buying, installing and starting are different steps
You can often buy and install a plan before departure. Check the instructions to see exactly when its days begin.
Choose the travel eSIM for data
After arrival, select the travel eSIM for mobile data and stop your home SIM from using roaming data.
Save the details offline
Keep the QR code, manual setup details and support instructions somewhere you can open without mobile data.
Follow the plan instructions
Phone menus and activation rules differ. Use the instructions that came with the exact plan you bought.
Common questions
What to check before you buy
Can I do these steps before departure?
You can complete many checks and installation steps over reliable Wi-Fi before travelling. First confirm what starts the plan so you do not begin it too early.
Do all phones use the same menu names?
No. Menu names differ by operating system, phone maker and software version. Use the phone maker’s current instructions when the wording is different.
What should I save offline?
Save the QR code or manual setup details, order number, provider instructions and support contact somewhere you can open without mobile data.
Explore
Read another guide
Install an eSIM on iPhoneSet up an eSIM on an iPhone and avoid common roaming mistakes.→Install an eSIM on AndroidSet up a travel eSIM on a supported Android phone and use it for mobile data.→Check eSIM compatibilityCheck whether your phone supports eSIM, is unlocked and can use two SIMs.→eSIM vs international roamingCompare the price, convenience and setup of a travel eSIM and ordinary roaming.→How much travel data do you need?Estimate the data you need for maps, messages, video, hotspot use and work.→When should you activate an eSIM?Understand when a plan starts so you do not activate it too early.→