Former employees have questioned Telecom's security policies and one can still look up customer details despite having left his job.

The office of the Privacy Commissioner has cautioned businesses against using confidentiality deals as "window dressing" as it probes a major security breach which allowed a rival access to Telecom customer details.

Telecom is investigating what it says is potentially fraudulent accessing of customer information.

The Privacy Commissioner is to investigate a security breach that has revealed personal details of every Telecom customer.

Telecom's entire executive team has cut up its corporate credit cards, as the company starts an efficiency drive.

Telecom won't face regulatory intervention over its premium copper-based VDSL2 broadband service which guarantees speeds of 15Mb/s up, 5Mb/s down.