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Your phone sends data over whichever line is selected for it, so select the KnowRoaming line. If your home SIM stays selected with its roaming off, you get full bars and nothing loads. Calls and texts stay on your home number either way.
The setting has a different name on each phone. On iPhone it is Cellular Data. On Samsung it is Mobile data, under Preferred SIMs. On other Android phones it is Mobile data, on the KnowRoaming SIM's own screen. It is separate from Data Roaming, and you need both: one chooses the line, the other lets it connect abroad. The taps, in order, are in Turn on data roaming for your plan on iPhone, Turn on data roaming for your plan on Samsung, and Turn on data roaming for your plan on Android.
On iPhone, one more setting can undo your choice. Allow Cellular Data Switching lets the phone move data between lines on its own. Turn it off while you travel: Settings > Cellular > Cellular Data > Allow Cellular Data Switching. If data keeps moving back to your home SIM after a restart or an update, see Phone reverting to the home SIM automatically.
Your plan is data only, with no phone number, calls, or SMS. Calls and texts keep using your home number.
When you get home, turn data roaming off and set your data back to your regular SIM, so you don't pick up roaming charges. Your KnowRoaming plan stays on your phone, ready for your next trip.
How to use an eSIM while backpacking is surprisingly simple. First, ensure your phone is unlocked and eSIM-compatible. Then, download the provider's app (like KnowRoaming's). You can choose your plan and add the eSIM digitally through the app, often by scanning a QR code. Once added, just enable data roaming for your eSIM, and you're ready to go, no physical cards or airport kiosks needed.
No swapping SIM cards, no kiosk queues at the airport, set it up once and it's ready every time after.
With KnowRoaming, setup takes less than five minutes. Using the automatic setup in the KnowRoaming app, you can download and add your eSIM in just a few taps. This makes it one of the fastest and most reliable ways to get connected before your trip.
Simply add the eSIM profile on your unlocked, eSIM-compatible device before you travel. Once you arrive in a supported country, turn on your eSIM, and you'll be connected!

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