 There are five regional area codes in use for landline calls, For example, a domestic toll call destined for a South Island location requires the dial prefix '03', being domestic-long-distance + 3 for the South Island.Mobile phone numbers are prefixed with 02, followed by one digit and the subscriber's number, which is either six, seven or eight digits, dialled in full, e.g.021 xxx xxx or 027 xxx xxxx.