"The nearest thing we have had to the countrywide Pokemon phenomenon was during the Rugby World Cup in 2011 but coverage has got a lot better since then.
"We have never seen a single app drive the amount of traffic over a concentrated period as Pokemon Go has. It has been insane."
For those wanting to escape the Pokemon madness, the good news is there are still a few places where smartphones struggle to get a signal.
Here are six Pokemon no-Go areas, suggested by Spark:
• Fox Glacier on the West Coast of the South Island.
• Cape Reinga, the northwesternmost tip of the country.
• Tane Mahuta, giant kauri tree in the Waipoua Forest, Northland.
• Devil's staircase, a tight, zigzagging road near Arthurs Pass in the Southern Alps.
• Maruia Springs hot pools, about 2 hours' drive northwest of Christchurch.
• Haast Pass, at Mt Aspiring National Park, near Wanaka.