It is unlikely disgruntled Spark customers will receive compensation following yesterday's five-hour long service outage.
The network failure impacted data, texts, and phone calls for customers in many parts of the North Island.
The telecommunications giant began to receive reports of service issues about 4pm, and services were returned to normal by 9.30pm, Spark spokeswoman Lucy Fullarton said yesterday.
Today, Fullarton said the problem was traced back to an issue with a key central computer system.
"(This) meant our customers' mobile phones had difficulty 'signing on' to the network to transmit or receive mobile communications."