I'm with 3 and they are okay. Customer service is a bit annoying (offshore) but they do always help me out when I need it. My DH always complains about the coverage but I dont have too many drop outs (though he is on the phone a lot more than me!). I have heard a lot of bad things about optus and everyone I know who is with them complains a lot. I dont think any of the telco's are great here so its a matter of choosing one that has the best phone/plan for you.