After activating MMS, the only iPhone 3.0 feature I was missing was tethering. A couple of days ago I was finally able to get it working.(1)
Google had sent me to this site a while back, but it didn’t have any profiles for mainland China.
After dead ends elswhere, though, I decided to try using the above site to create a profile.
I clicked(2) on “Mobileconfigs… create” and entered the following settings (I left the rest of the settings blank):
Then I clicked on “GENERATE!”. It asked me to accept, I did, and then the tethering option was available in Settings–>General–>Network–>Internet Tethering.
So tethering now works, but I haven’t yet had the need to use either it or MMS. At least they work…
(1) Try this at your own risk. It worked for me, but your phone might explode. Also, I assume it only works with an iPhone 3G or 3GS (although it doesn’t need a 3G network, because I’m using China Mobile’s Edge(?) network).
(2) I guess “clicked” is the wrong metaphor, but “touched” doesn’t seem right either.