Device verification sends a message from the SIM of the mobile number registered with Kiwi, so that SIM needs to be in the phone you are using.
If you use a dual SIM phone, check that the registered number is active and can send SMS.
If you have moved the number to an eSIM or a new handset, complete that setup first, then retry.
Check that the Kiwi app has permission to send SMS in your phone settings.
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