Singtel Optus Pty Limited (commonly referred to as Optus) is an Australian telecommunication. It is a wholly owned subsidiary of Singtel. Optus is the second-largest wireless carrier in Australia, with 10.5 million subscribers as of 2019.
Optus mostly owns and operates its own network infrastructure, It provides services both directly to end users and also acts as a wholesaler to other service providers.
The company was originally known as Optus Communications Pty Limited. It went through the names Cable & Wireless Optus Pty Limited, Cable & Wireless Optus Limited and SingTel Optus Limited before changing to its present name.
Optus is divided into four major business – Mobile; Business; Wholesale; and Consumer & Multimedia