I've tried putting my number anyway and for some reason, after clicking "Get started", the page becomes white (same page) and nothing happens. If someone has some thoughts about this?
If I remember correctly (I wish my memory would work better), after entering my number, I've got an SMS with the link to the app to download. But I live in EU.
Since you already gave them your number, maybe you try your chances with the app too, maybe you get more info.