100LL - Welcome back.
Other than get sued, you can also get robbed if you're in the electronics business. If you're online you seriously do not want customers walking in too ...Being in a industrial area, and even not listing phone numbers on the web site and hiding domain registration information is common in the ecommerce industry from Hong Kong. It is too easy to get sued nowadays. Also, they want to avoid customer contact by phone or customers walking in, because it just takes too much time.
If you're shipping within HK you do need a proper phone number - simply because people will call, if nothing else, to verify that you're a real and HK based entity.