Three quick checks
Have Wi-Fi and your package QR code ready.
Confirm that an Add SIM or Download new SIM option appears and that the device is carrier-unlocked.
The menu path can vary by Android version, model, country, and carrier.
Step-by-step activation
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Open SIM settings
Go to Settings → Network & internet → SIMs or SIMs & mobile network.
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Add a new SIM
Tap Add SIM, then Download new SIM or Download a SIM instead, depending on your model.
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Scan the QR code
Scan the provider QR code and confirm downloading the profile.
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Enable the profile
Name the new eSIM, enable the line, and select it for mobile data.
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Finish travel settings
Enable Data roaming for the eSIM only if the package instructions require it; keep roaming off on the primary SIM.
Check your connection
Check that the new profile is on and selected as the default for mobile data on the SIMs screen.
Review automatic SIM switching to prevent unintended use of the primary line.
If there is no connection, toggle Airplane Mode and restart the device.
If a step does not work
Download new SIM is missing
Check the exact model number, Android update, sales region, and carrier lock.
Download does not finish
Try another Wi-Fi network and confirm that the QR code was not used before.
No internet
Check the mobile-data SIM, data roaming, and any APN instructions supplied by the provider.