I am receiving calls twice a day from this number, but have ignored because they won't leave a voicemail message.
Thanks for the info, I am glad I didn't take the calls.

It was Optus, trying to sell me stuff yet again. Looks like they've only recently started up with this number though.

Blocked the number. They've tried 3 times now. missed the first 2, researched the number and deliberately ignored the 3rd. If they don't leave me a voicemail it can't be very important.

Is very annoying as they call during a time I'm usually asleep. (nightshift)

They've called me a number of times this week saying they are calling on behalf of optus. They were asking for my full name, home phone number and address, which shouts scam to me and Optus would know these details. Be cautious with these people.

The number is from optus. I rang optus general inquiries to confirm it and was told it was an optus telemarketer trying to offer my a deal with a tablet as my personal data usage was high. From calling the general inquires i requested to be taken off the telemarketers call list and optus then opted me out of there call cycle so i would recommend you do the same to avoid future calls.

They call a few times each day but never leave a message. Annoying

said they were optus than hung up...

I have received calls where no one speaks and then hangs up from this number. I can't help but think this is a fake optus scam, but I really don't know.
Be cautious.

Keeps calling me throughout the day. Who is it!?

This number called this morning but i missed it - wish these people would find a new occupation...

Same - missed call today from 9009 6644. No voicemail.

I had a call from this number today and they told me they were from optus and trying to sell me something...told me that I was paying excessive amount for my monthly phone...they did not have access to my records..however had access to data showing internet transfer from my bank account to optus..I pre pay fixed rounded amounts and they were quoting those amounts as being my actual Optus bill. You have to wonder where they are from...and how they get your bank transfer information...

This number calls me everyday around the same time, glad I ignore them.

Was called by (03) 9009 6644. Person claimed to be working for Optus and wanted to save me money on home telephone & internet plan. Did not ask for verification that they were with Optus and did not proceed with call. If they were from Optus however I would expect my phone to recognise that they were from Optus as my mobile phone plan is with them.

The number is from optus. I rang optus general inquiries to confirm it and was told it was an optus telemarketer trying to offer my a deal with a tablet as my personal data usage was high. From calling the general inquires i requested to be taken off the telemarketers call list and optus then opted me out of there call cycle so i would recommend you do the same to avoid future calls.