Here it is. Screen shot of my iPhone 3G using SmarTone-Vodafone.
Why is it unlocked? Because in HK you can port over your number to any carrier...your number stays with you as long as you like and with whom ever you like. So while you switch to a new carrier and you chose to keep your old number, it takes about 5-7 days for your existing contract to terminate and transfer (port) over your number to the new carrier. All is done by the new carrier. So during this time, you use your current SIM card until the date it expires, then you use the new SIM provided by the new carrier.
This is what happened to me when I signed up so I was shocked to learn it was unlocked and when you connect it to iTunes for the 1st time using the non-exclusive carrier, iTunes automatically detects the SIM and downloaded the carriers info...in my case SmarTone Vodafone. Besides, phones are not allowed to be locked to a carrier in Hong Kong even though 3HK has exclusivity on the iPhones. Anyway, I switched to 3HK today and the browsing IS faster than SmarTone-Vodafone in case anyone is interested to know and the battery life seems better?