im with telstra. i was with vodafail before on the 45 infinite. it was a good plan but i needed more coverage and was getting pretty fed up with the drop outs. now im paying almost double that but imo its 100% worth it. havent had a drop out. always have internet connection and theres 4g rolling out into most suburbs now. im using the lumia 920 which i am very happy with. but IMO if you barely use your phone and stay mainly near the CBD, voodafone should be sufficient. i cant comment to much on optus but from my friends who have it they seem pretty happy with it. my understanding of optus is that its somewhat of a middleground between Telstra and voda.