Telephone numbers in Australia plan (including the "Trunk Access Code"), presented in domestic format. (Geographical region boundaries do not exactly follow State borders.) The current numbering plan would appear to be sufficient to cope with potential increase in demand for services for quite some time to come. The 06 and 09 area codes are completely unused. In addition, each current area code has large number "ranges" unallocated. When dialling from outside Australia, after dialling the appropriate International Access Code it is necessary to dial the Country Code for Australia (61) followed by the nine digit "National 'Significant' Number". (The + symbol is used to
Area code 602 areas of the metro area. And it is the only million-plus populated area where 7-digit dialling would still be possible. Area code 602 North American area code 602 is a state of Arizona telephone area code that covers most of the city of Phoenix. It was one of the original area codes established in October 1947 and originally covered the entire state of Arizona until 1995, when area code 520 was established as the state's second area code. Arizona's explosive population growth during the second half of the 20th century would have made a split necessary in any event. However,