Mixed reactions to the Commerce Commission's request to improve mobile phone plans through easier comparisons

It's found a quarter of people are spending 12 dollars more a month than they need - with some residential customers paying nearly 50 dollars too much.

Spark, Vodafone and 2degrees have responded, saying they will be working with the request.

Spark will assess whether providing historic usage data would be valuable to its customers.

However Vodafone says it's not as straight forward as looking just at data allowances versus usage and price.