"buying a local SIM card is essential. Getting the 3G working is a whole other ball game"
When travelling a country for a while buying a local SIM card is essential. This can be a challenge in certain areas of the world. Especially if no English is spoken. Often the SIM card works fine but the 3G is not configured correctly! Anyways I found this great little site that helps you configure the 3G settings for loads of countries and companys.
Whilst connected to wifi go to the following site.