The mobile phone company Spark is keeping customers' valuable geographic location data for seven years, five years longer than the US average.
2degrees did not say how long it keeps it - but that it has sold it in anonymised form in the past - and Vodafone says up to 14 months.
In America, mobile carriers are under federal investigation and some have been fined over how they handle the geo location data.
It opens a clear window into people's lives and is valuable, such as to advertisers, but also to data brokers - and buyers have included the US military.
Phil Pennington is looking into this.
