You may be able to use your existing mobile phone with a Western Australian SIM card, provided your phone has been unlocked from your original carrier service.
Using a phone and a SIM card from another country can be very expensive.
Emergency telephone number
000 is the free emergency number for police, ambulance and fire brigade.
Call 13 14 44 for police assistance or attendance when not an emergency.
International calling codes
Australia's international country calling code is +61.
Western Australia’s area code is 08. When calling a Western Australian number from overseas, you drop the 0 then dial +618 followed by the regular phone number.
Mobile phone numbers in Australia start with 04. When calling a mobile phone from outside Australia, the 0 is dropped so the number starts with +614 followed by the regular phone number.
To make an international call from Australia, dial 0011 followed by the country dialling code and the area code. Drop the zero then put in the regular phone number.
To find a country dialling code, visit the Telstra website.
Interstate area dialling codes
Australia Post operates Australia's postal system, with mail delivered Monday to Friday. At Australia Post branches you can also pay certain bills, apply for passports and send money overseas.
Australian suburbs and towns are identified by a four-digit postcode which must be used when addressing a letter or package.
To find out more, visit the Australia Post website.