I also get the same optus disconnected speech but sometimes with disconnected or unavailable ending followed by some more weird code 02TD1140.... dont know if this helps anyone but maybe this is a conspiracy and we are all drawn but some force?? or its just dumb luck. Either way its rather interesting.

thanks nice to know..... thought i'd missed an important call

Googled this number after a missed call and found this page. Contacted Vodafone Australia and the operator got very defensive and said they couldn't tell me who that number was for(privacy reasons) but 'it's not vodafone'. After a quick but painful chat got myself removed from the automated survey list(supposedly).Just call Vodafone and ask them to take you off the survey list.

I got a call from this number too and it was about new international plans from Optus.What I am gathering though is the number is a marketing company that both Optus and Voda use. Working in the phone industry myself I know a lot of business such as these have numbers that cannot be called back, hence why people get engaged signal or a not connected message when they try to call back to see who it is.

I'm with Optus and just had a missed call from this number.Also judging by the time of the call 5:30pm it is telemarketing.

3 calls from (02) 8666 6630 in 2hrs, 2 voicemail msgs which i havent had the chance to listen to yet....from reading everyones comments here there hasnt really been a solution to stopping it, but my question is, does anyone keep getting the calls?? a few missed calls in one day isnt so bad, but i would hate for it to go on....