Re:FaceTime is coming to Android and Windows via the web
by Twisell on Tuesday June 08, 2021 @02:04AM
(#27431130)
Any number is usable though, it can be a landline and use automated call rather than sms.
Point is to limit false account (and I guess also having some clues about real identity in case of abuse).
You cannot create an Apple account without providing a phone number.