Will I be able to use an Australian mobile phone (3 Network) in China? I know that I can do international roaming but I am unsure about any frequency differences.
I have an iPhone 4 on Telstra's 3G network and it switched over immediately as soon as I switched it on in China.
I immediately received an SMS telling me that data was disabled, but could be switched on at a cost. I just used wifi hotspots for data as necessary.
The phone switched over to China Telecom's network and call quality and coverage were excellent.