The Commerce Commission's recommendation to extend phone number portability services until 2021 is good news for consumers.

Portability allows you to keep the same landline or mobile phone number when you change providers. More than a million New Zealanders have done so since portability was introduced in 2007.

In its draft determination, the commission also proposed the hours portability can be done be extended from weekdays to include Saturdays. It said people were now connecting to the UFB network on Saturdays, which sometimes involved switching providers.

Telecommunications commissioner Dr Stephen Gale said portability "enhances competition in the market as it removes a disincentive for consumers to leave their current provider if they see a better deal elsewhere".

Submissions on the draft can be made until December 1. The final decision is due on December 19.