One NZ and 2degrees customers are experiencing outages to internet and calls across the country.
The telecom company said the issue was under investigation.
The South Island and the lower North Island were experiencing the outages heavily, with Christchurch and Wellington listing the most outages on One NZ's outage map.
The company acknowledged the widespread outages under one report.
"We're aware of an issue affecting some of our cell sites and internet across the Lower North Island and the South Island. This may result in intermittent or no service for some customers in these regions."
The company said some customers' internet or calls were dropping out, and it had opened One NZ Satellite access to more customers in affected areas.
"We're sorry for the disruption, and our teams are working hard to get everything back up and running as quickly as possible."
It said customers could still stay connected using WhatsApp calling, messaging, and data through its satellite service.
2degrees said on its website it also was aware of the outages.
"This is related to the widespread One NZ incident. One NZ is working to restore services," it said.
Automobile Association (AA) centres across the lower North Island and the whole South Island are closed as a result of the internet outages.
"We're working closely with local teams to manage this and will reopen services as soon as it's practical to do so," it said on social media.
The AA was asking people to check with their local centre before visiting.
"We appreciate everyone's patience and flexibility while this issue is being resolved."
The website Downdetector showed a spike in outages for One NZ, Spark and 2degrees this morning.
A Spark spokesperson said there has been no impact to Spark's network from this issue.
There were comments on the post from people around the country who said their internet had not been working - although some also reported it coming back in after 10am.
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