I'm travelling to Beijing for a few weeks next month and would like some tips on using my iPhone. Specifically, is getting it unlocked and buying a local SIM card a good idea (my carrier is AT&T)? Should I just put it into airplane mode and duck into WiFi hotspots when I need to get on the internet or check e-mail? It would be nice to have voice and the ability to use data on the street, but it's not an absolute requirement/. Also, can anybody recommend any good apps for travellers in Beijing. Any help or tips would be appreciated. Thanks in advance.