Spark says it has largely fixed a fault with its mobile broadband network that affected mobile broadband customers around the country.
The fault also had a small “knock-on effect” on some people trying to use their mobiles to call and text.
Spokeswoman Michelle Baguley said 4G data, text and voice services were back to normal at about 2.15pm.
The remaining outages at 4pm were to 3G services in small parts of Auckland and Hamilton, which it expected to be restored “shortly”.
The fault with its mobile network, which Spark first reported shortly after 11am, had been intermittent, she said.
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While the mobile broadband issue had affected customers nationwide, Baguley believed the knock-on impact on calls and texts had been “marginal”.
Those knock-on issues had been due to congestion caused by devices re-authenticating on the network, she said.
Baguley did not believe the 84,000 Spark customers on its Wireless Broadband home broadband service had been impacted.
The root of the problem was a fault on Spark’s billing platform that had a knock-on effect on devices authenticating to the mobile network, Baguley said.
“This caused an authentication ‘traffic jam’. The best metaphor would be a crowd of people all trying to get through a door at once.”
Spark mobile customers last experienced significant network issues in January, when a Sunday morning outage caused problems that dragged on until the evening.