The cause of four outages to Telecom's XT mobile network since Christmas remain unknown, the head of Alcatel-Lucent says.

Customers wanting to get out of Telecom XT contracts may have grounds to do so - but only if they have been the victim of repeated faults in the network.

Telecom admits it has still not determined the exact cause of its crippling XT network outages.

Vodafone and Two Degrees are launching offers specifically for disgruntled Telecom users in light of recurring disruptions to the XT network.

A lobby group says mobile customers will pay if the telecommunications industry is not regulated.

Telecom's troubled XT network has suffered another outage this afternoon with customers south of Taupo experiencing major disruption.

The Commerce Commission, in a split decision, has rejected regulation as a means to reduce the costs of mobile phone calls.

The company that installed Telecom's XT network faces different problems with other parts of its global business, a US corruption probe shows.

Still reeling from the XT debacle, Telecom must woo back disgruntled customers and rebuild its image.

Four Manila-based call centre staff have been suspended over abusive text messages sent to Telecom customers.

Telecom admits a "serious hardware failure" was responsible for a widespread outage in its much-vaunted XT mobile network.

Telecommunications reporter Helen Twose talks to 80s hair bands, gets tweeted at by a shrub, sees Audi's Wi-Fi-toting A8 and meets a guy paid to roll his eyes at the Mobile World Congress.

Telecom is investigating claims a customer received an abusive text from its call centre after complaining of delays in her cellphone service.

Telecommunications reporter Helen Twose looks at the latest and greatest from the show floor at the Mobile World Congress in Barcelona.