Telephone services are provided via the Doveton Street (BRAT) telephone exchange which was originally built by the Australian Telecommunications Commission (now known as Telstra) who remains its owner, though Optus now also operates services from this facility. The city's cellular network currently uses Universal Mobile Telecommunications System (UMTS). Telstra has provided mobile telecommunications to Ballarat since 2003 (initially as CDMA). Optus provided competition with its entrance to the market in 2003 along with significant service upgrades in 2004 followed by Vodafone in mid-2009.