How patriotic of you. xD.
Telstra already monopolises our landlines, and I prefer not to use them because they're generally more pricey and I used to work for Optus.
My mobile phone is with Three. It does the job. Lots of free minutes to other Three users which is good for calling the missus.
I'm using the Samsung Omnia atm (first version) and it's good, I s'pose. I don't really need all the faux-smartphoney things it does because I just call, text and take photos, so I'll probably make a switch when the contract runs out. My girlfriend gets annoyed at the touchscreen, but I don't mind it. The QWERTY touchscreen keyboard is a plus, but the preset skin had tiny little icons that left me resorting to my stylus until I got the hang of it.