If you are referring to internet tethering, then yes. But the
computer must have itunes installed. Basically, your iphone will be
the BBOM dongle and use your 3G network to access the internet.
Data charges do apply.
To date, the default APN settings for starhub and M1 do not
allow it, so you need to google for the settings which you can
download and override. Some of the older singtel ones might require
to do the same. However, there is a risk that the modified APN
settings will screw up your MMS settings.