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
National conventions for writing telephone numbers 7 everywhere else. South Africa uses 10 digit dialling which became required since 16 January 2007. The 10 digits used for local calls (AAA XXX XXXX or 0AA XXX XXXX) consists of a 3 digit area/type code (the first digit in the area/type code is a trunk prefix) and 7 digits. All area codes including mobile start with a "0" (trunk prefix) for domestic calls. When dialing from another country the international calling code for South Africa is "+27" with the rest of the digits excluding the trunk prefix (+27 AA XXX XXXX). The International Telecommunication Union sector ITU-T issued