The data is collected bi-annually. The data transfer volume in the mobile network has been reported in terabytes, i.e. in thousands gigabytes during the time periods of 1 January to 30 June and 1 July to 31 December according to results.
The data transferred in the mobile network includes the packet switched data traffic sent from or received to telecommunications operators' mobile subscriptions at a given time. The volume contains both the traffic the user has sent (uploaded) and the traffic the user has received (downloaded).