Depends on his skill set and how easily a HK company can hire a local to do the job. I know a few English only speakers that work in IT in HK. They were all hired from abroad and have very good specialist skills though.
These days if you are up to no good you should leave your own mobile at home. I suppose there are people who might not know that, but sim registration is pretty pointless endeavor. They tried this twice before and realized it was a waste of time so I'll go with it wont last very long. I had a mate register mine in HIS name!!!
I didn't say I'm scared of it. I'm saying it's a fruitless exercise (if it's being done to prevent terrorism, or any illegal use of communications). If you use mandatory SIM registration, something else will become the most convenient means of detonation. You're just wasting your time trying to close off that avenue, and wasting your time arguing it will have any effect. You can go to any shop that sells soldering irons and buy everything you need to detonate a bomb from hundreds of miles away. You can even use the radio devices used in radio controlled toys. What will you do then, start banning radio controlled toys? I built my first FM radio transmitter when I was ~15 years old and started broadcasting on the same frequency as BBC Radio 1 to interfere with it for a laugh, even though it's completely illegal to do so. I have WiFi equipment sitting in my office that will reliably bridge WiFi communications for 5 kilometres. You can buy WiFi routers from ANYWHERE. You can even make the crappiest WiFi router transmit for many miles with a wok or a satellite dish. What next, ban WiFi routers and woks?