I'm in Singapore for a week and would like to use data with my iPhone5. What are the options that include enough data for moderate to heavy usage (1-2GB should be enough for the week).
Singapore has three mobile phone operators and given the small size of the country, their coverage is fairly similar. Their offerings aren't very differentiated for contract plans, but for pre-pay plans there are some differences.
All you need to get a pre-pay SIM is your passport and then you can buy the SIM cards from any convenience store, or a company-specific mobile phone shop. I also wrote about getting Internet access in Singapore on my blog - it's a bit out-of-date but may be helpful nevertheless.