Hi, the book I'm using to learn Chinese offers the following model to ask about somebody's room number 你的房间是多少号/号码? (are both 号 and 号码 correct in this case?) I was wondering if, similarly, it would be possible to ask about somebody's telephone number 你的电话是多少号/号码? However, in this thread, a different structure is shown, namely 你电话号码是多少? 你电话号码是什么? Are all proposed alternatives equally right?