Furthermore, the Australian Competition and Consumer Commission (ACCC) is investigating trade practices and fair trading "issues".

"The ACCC is looking at number portability and issues which may be unnecessarily locking you in," Brooks said. "For example, you can't take numbers with you when you move service provider and you can't take a home number to a VOIP provider. So there may be new requirements made for number portability."

Brooks said misleading advertising and inadequate disclosures are also being investigated by the ACCC.