How to buy a SIM card in Singapore
SIM cards are widely available in Singapore from multiple carriers. Pre-paid SIM cards can be topped-up at 7-11s and Cheers Convenience Stores. All SIM cards must be registered so foreigners must present their passports. There are a number of booths at Singapore Changi airport selling SIM cards and they come with many different options. A 3G-only SIM is available and useful if you don't require a local number and just want a data connection.
Singapore mobile phone providers include: