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"This code has already been used" error
This isn't a fault. Each QR code adds one eSIM to one device, once. Most of the time the plan is already on this phone and the first attempt only looked like it failed; check your SIM list before you do anything else.
Check first
Open your SIM list. iPhone: Settings > Cellular. Samsung: Settings > Connections > SIM manager. Other Android phones: Settings > Network & internet > SIMs. A KnowRoaming line there means the add worked. Leave it off until you land, then follow Turn on data roaming for your plan on iPhone, Turn on data roaming for your plan on Samsung, or Turn on data roaming for your plan on Android.
Causes, in order
The plan is already on this phone
The most common case, especially when the first attempt showed an error partway. If the line is in your SIM list, you're done.
You're adding it to a second device
An eSIM belongs to the device it was first added to. A second phone or tablet needs its own eSIM and its own plan. In the app, go to My plans, tap Add another device and plan, and set it up on that device. See A second device on the same trip: What it needs.
You deleted the eSIM from your phone
A deleted eSIM can't be restored with the same code. Don't keep retrying. Message us with the details below; we'll check which device the code was used on and tell you what happens next.
Still not working?
Still not working? Message us on WhatsApp at +1-888-357-7347 and include four things: your ICCID, your order number, your phone model and OS version, and what you've already tried.
よくある質問
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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