Scammers who take your money without your knowledge or permission, Premium Charges to mobile accounts post or prepaid.
I have contacted Optus who advised me the charges where from Digital Turbine so I did some research to find this info.
http://www.digitalturbine.com/
level 2/221 Miller St North Sydney 2060
Ph.0299258888
After some more research I found that they are also known as Mirror Image Access (Australia) Pty Ltd and they are some dodgy Telco who Offer "Premium Support" and still have a phone number but website has been taken down.
Mirror Image Access (Australia) Pty Ltd PH# 1300724406
https://www.tio.com.au/members/members-listing/MIRROR
Australia