I could subscribe easily.
On the following 31 december it was no longer possible to login. I discussed many times with different support (email and telegram). They didn’t help me. Few months later I could get help from the Huobi chat girl. After one month she wrote me that they made a failure. Thereafter I could login again. But several month later I couldn’t login once more. The Huobi chat girl wrote me that I can login with my telefon number. Indeed I could.
But there are too much cryptocouples like BTC/ICX where you are not allowed to buy or sell more than a little quantity of cryptocurrency. I already loose money because I couldn’t sell all my cryptocurrency.
If you are happy with Huobi, be prepared to change your mind and loose money!