New Zealand's telephone numbers are arranged by country code, area code, telephone number. New Zealand's country code is 64.

To make an international call to New Zealand, dial your local international access code (typically 00) followed by the New Zealand country code (64) followed by the area code for Auckland (9) followed by the seven-digit telephone number. For example, 00 64 9 123 4567.

To call internationally out of New Zealand, you need to dial New Zealand's international access code (00) followed by the country code (followed by the area code for where you are calling if necessary), followed by the telephone number. For example (for the USA), 00 1 212 123 4567.

To make a call to Auckland from anywhere within New Zealand (but outside of Auckland itself) you need to dial the national access code (0) followed by the area code for Auckland (9) followed by the seven-digit telephone number. For example, 09 123 4567.

When calling within New Zealand, the area codes are:
9 - Northland, the Bay of Islands, Auckland
7 - Coromandel, Bay of Plenty (Tauranga), Waikato (Hamilton)
6 - Hawkes Bay, Gisborne, Palmerston North, Wairarapa
4 - Wellington
3 - The South Island (Nelson, Christchurch, Dunedin, Queenstown, Invercargill)

To make a local call (to a number located in the same town or city that you are in) you just need to dial the seven-digit telephone number. For example, 123 4567.