Across the period, New Zealanders spent some 10 billion minutes on fixed-line phone calls and 4.35 billion minutes talking on their mobile phones.
About 14 billion text messages were sent over the 12 months.
New Zealand had 1.24 million fixed-line broadband connections and 4.9 million mobile connections, the report said.
Revenue in the mobile retail market was $2.38 billion in the year ending June 30 2012, up from $2.14 the year before.
The report said that total telecommunications revenue in the retail market was $5.22 billion, up from $5.03 billion the year before.
In both the fixed-line and mobile market revenue from voice calls were down over the period, while revenue from broadband was up. Mobile broadband revenue was growing quickly and reached $354 million in 2011/12.
Over the 12 months, investment in telecommunications showed a "mild rebound", the report said.
Although down on the peak investment of $1.69 billion in the 2008/09 year, telcos invested $1.26 billion in 2011/12, the report said.