The data is collected bi-annually. The data transfer volume in the mobile network has been reported in million 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). The volumes do not contain roaming traffic or data traffic from M2M subscriptions.