Bought the Huawei MiFi E585 for S$185 from Amos of Hardware Zone Forums. It is a mobile router that makes use of your SIM card to connect to the Internet and the router itself supports 5 devices simultaneously.
It is similar to any 3G Modems but instead of only allowing one device (normally only computer) to use it via USB port, the MiFi allows up to 5 devices as long as the device have WiFi support which most if not all of the smartphones these days do. The MiFi is essentially a mobile router and hence it is capable of basic router functions such as DMZ, DHCP, SSID configuration, etc. You can configure those options using the router’s web-based interface (192.168.1.1) and the interface is mobile friendly as well. The E585 also comes with a MicroSD slot that you can use it as a shared storage for all the connected devices.