If you don't have a phone number, you could register with a phone number of a person you trust.
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Once you have received the e-mail, please click on the link “Your personal link for linking samples” and enter the PIN you received via SMS, then you can create your own PIN immediately.
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As soon as you have a new phone number, you can change it yourself.
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Please find attached the instructions for changing your phone number:

I entered my data incorrectly. How can I correct them? | COVID-19 TEST | Help Center (c19t.st)
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Info: The test result is always sent via SMS and e-mail.