Roaming with 3
Have you done the seperate piece of paperwork to actually set up proper roaming with 3. It is a seperate form ( i asked for full roaming and IDD access from day 1), I don't have any issues with roaming on my phone. I do get an SMS on arrival into each port telling me how to ring home in HKG, no other problems
HKG dropped calls - In a perfect world you wouldn't have to do this fix but this is my solution.
I don't have an Iphone, however on my phone I lock the phone onto the GSM bands ie lock out the 3G bands. as a result I don't drop calls and get very good coverage in HKG. just unlock the 3G band if you need the high speed data/internet access. Create a shortcut to this function and it doesn't get in the way that much. The reason that I'm still with 3 is that their data plan beats anything else that I can find.
Recommend the airport 3 shop, quickest queues (often none) and often the best understanding of my spoken English language.
If someone finds a better data plan with the other carriers I'd love to hear about it.