and there seem to be many APNs (telstra.wap, telstra.mms, telstra.internet)..
I only can find this on GUI level:
Telstra Internet (radio button, default on) and
Note: the Hong Kong phones also support tri-band 3G Networks — HSDPA
850/1900/2100 (850/1900 for US, CA, 850/1900/2100 for Asia, AU, and
900/2100 for EU.)
Well, the network scan for 3G says: "Telstra available" (and Optus and
Vodaphone forbidden - I have a Telstra SIMM) so I am fine, I guess?