I don't have chinesse phone number too. And they weren't able to verify my european phone number. But they verified photo of my european passport. And I enable 2 factor verification (downloading Google verification app). And based on my passport and 2FV I was able transfer Bitcoin in, change it for Yuan, buy XAS and transfer it to my offline wallet. No need for phone verification. Just passport and 2FA.
Good answer for the questions, some of which is what I want to know, I Hope more and more western investors can join in the promoting team to make this Chinese community to be more international.