Just a tip for short-term newbies to HK (like me)
For the new bros in HK, you may need a local HK pre-paid SIM card.
Way cheaper than using your usual number.
I first bought a normal pre-paid SIM from PCCW. It did not have any special 3G package on it. So it charged per usage. I quickly found out this was very expensive as I burned through 100 HKD in one afternoon surfing Sex141.com on the move. LOL
I then went back to 7-11 and this nice lady recommended me a "3 HK" card instead. It has a cap of 18 HKD a day for data fees. So it's probably great value for me. 100 HKD could lst 5 days for heavy 3G surfing, map usage and photo viewing.