After Steve Jobs' announcement at the "iPad 2 Event" that the Personal Hotspot feature will be available in iOS 4.3, people have been wondering if their mobile carriers will allow the feature to work, and how will these carriers charge for the usage of this feature on their network. Like these users I wonder about it for my current mobile carrier, Smartone-Vodafone (SMV) in Hong Kong. So right after the iPad 2 Event I posted a question on Smartone-Vodafone's Facebook Page asking them to comment on the feature's use on their network and the charges if any. All SMV has to say is "We do not have any information regarding Personal Hotspot at this time, please stay tuned".
Fortunately Apple made iOS 4.3 available a day early (March 10th) since my bill-cut-off date is the 11th. I installed it right away and tried the Personal Hotspot feature, only testing the speed of the connections of devices connected to the Personal Hotspot host. Because I have yet to confirm with SMV the charges relating to Personal Hotspot use. I waited all weekend and Monday for my March 13th bill to be available online, and it was finally available a few hours ago. As I have expected, SMV is able to distinguish the Personal Hotspot traffic from other data use, just like regular Tethering via USB, but unlike regular Tethering over Bluetooth. Apple probably provided the carriers a mean to identify Personal Hotspot traffic, since carrier partners are given the ability to turn on and off Personal Hotspot for individual subscribers on their network. The Personal Hotspot connection I tried was via WiFi, I'm sure the results will be the same through Bluetooth and USB.
Also as expected, my Personal Hotspot usage was "FREE". I have SMV's HKD389 iPhone Plan with unlimited data, which also comes with a handset rebate, giving me a monthly bill of HKD259 (USD33.24).
In the past month (30 days) SMV's bandwidth had dropped dramatically. On average it had fallen more than half as compared to previous measurements. I'm sure SMV is monitoring Personal Hotspot usage to see if it further congest their network. Fortunately, I currently also have access to the CSL 1010 3G network, and it is indeed much faster than SMV's 3G network at all locations: Wanchai, Central and Admiralty, I've tested. In most cases it is faster by 50% - 100%.