Singtel Optus Pty Limited d/b/a Optus is the second largest telecommunications company in Australia and is a wholly owned subsidiary of Singaporean company Singtel. The company primarily trades under the Optus brand, while maintaining several wholly owned subsidiary brands, such as Virgin Mobile Australia in the mobile telephony market, Uecomm in the network services market and Alphawest in the ICT services sector. To provide services, Optus mostly owns and operates its own network infrastructure, and also uses the wholesale services of the National Broadband Network and Telstra. It provides services both directly to end users and also acts as a wholesaler to other service providers such as Exetel and Amaysim. Through its Optus 'Yes' brand, it provides broadband, and wireless internet services. Other wholesale services include Satellite and 4G Mobile. The company was originally known as Aussat Pty Limited prior to privatisation, when it became Optus Communications Pty Limited. It was later renamed to Cable & Wireless Optus Pty Limited before changing again to its present name.