Can I surf the internet on my mobile phone when I travel to Hong Kong?

First of all, there is no signal on the mobile phone to Hong Kong, let alone surfing the Internet or making phone calls. Last week, I suggest you buy a phone card from Hong Kong, which is not expensive, just a few dozen.

Secondly, only if you open international roaming and go to the local business hall as mentioned in the recommended answer, you need to pay a deposit of 8rmb. As for the fact that you can't use international roaming, you can't use your domestic package when you go to Hong Kong. You can consult the business hall for details.

Finally, even if you have an international roaming, you'd better not surf the Internet in Hong Kong. One meter is like 1 yuan. You should be playing Weibo or something. In fact, many places in Hong Kong have wifi coverage.