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What is an eSIM, really?
An eSIM is a SIM built into your phone instead of a plastic card, and it does the same job: it connects you to a network. Nothing to insert, nothing to lose, and nothing to swap at the airport. Your number, contacts, apps, and messages all stay exactly where they are.
Your phone already has the hardware, a small chip fitted at the factory. Adding a KnowRoaming eSIM writes a profile onto that chip, in about a minute, on Wi-Fi. Phones that support eSIM can hold more than one profile and run two lines at once, which is how a travel plan and your home number end up on the same phone, side by side.
You add the KnowRoaming eSIM, called KR.One, once, and then add a plan to it for each trip. It sits on your phone until you land, then carries your data while you're away. Keep it after the trip; next time, you add a new destination plan to the same eSIM in the app, with no QR code and no setup. One eSIM, every trip.
Two differences from a plastic card are worth knowing. An eSIM belongs to the phone it's added to; it can't be popped out and moved to another phone. And the whole add happens on the phone, in the app or from your phone's settings, with no kiosk and no post.
- Your plan is data only, with no phone number, calls, or SMS. Calls and texts keep using your home number.
- Your plan starts when you connect in a supported country, not when you buy. Your validity days count from that first connection. Unused data expires at the end of your validity period. It doesn't roll over.
- KnowRoaming plans work on iPhone XS and later and on most Android flagships released since 2019. Your phone also needs to be carrier-unlocked. Check your exact model on the device compatibility page before you buy.
- If it works today with a plastic SIM, it works the same way with an eSIM. The only thing you'll notice is that nothing needs swapping.
常见问题解答
Quiet destinations often lack SIM kiosks or reliable stores. An eSIM allows instant activation, monitoring, and top-ups without needing physical access.
Yes, eSIMs use the same encryption and standards as physical SIM cards.
Buying an eSIM online is easy. Simply visit KnowRoaming.com or download the KnowRoaming app (available on iOS and Android). Choose your destination and plan, complete your purchase, and receive your eSIM instantly via QR code or in-app setup.
Use a prepaid international eSIM for F1 fans so you pay local rates instead of roaming charges.
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