It’s possible to buy a wireless router, and share your 3G mobile broadband connection. This is great for people on the move and need to share an 3G internet connection.
It’s also great if you have a small office or a small network setup, and want an ad-hoc network, or want a backup to your landed cable/DSL/fibre connection.
I’m not sure about the other carriers/ISPs, but the settings for Starhub are:
Connection/APN name: StarHub Internet
Access point name: shwapint
DNS 1: 220.127.116.11
DNS 2: 18.104.22.168