000 is the primary emergency telephone number in Australia. Secondary emergency numbers are 106 (for use by the hearing impaired with a TTY terminal) and the international GSM mobile emergency telephone number 112 .Increased awareness of the 112 emergency number in Australia has led to the potential for confusion over which number to call in an emergency. As a secondary emergency number,112 is not guaranteed to work from all technologies; most notably,it does not work from land lines. In order to encourage use of 000, mobile telephones imported commercially into Australia are required to be programmed to treat 000 in the same fashion as 112 (i.e. dialling with key lock enabled,use of any carrier,preferential routing,etc.) ]. On older or privately imported (e.g. roaming from another country) telephones,000 may not receive such preferential treatment. A proposed amendment to the Telecommunications (Consumer Protection and Service Standards) Act 1999 would prevent carriers from providing emergency services access to SIM-less devices,i.e. mobile telephones that do not have a SIM installed.