The number of mobile subscriptions contains all the subscriptions acquired by households and companies, excluding such subscriptions that have been sold to be used only in so-called Machine-to-Machine use (e.g. for electricity metres).
Mobile data-transfer subscriptions can be divided into different kinds of subscriptions, according to subscription agreements. In the statistics, subscriptions have been classified first by means of invoicing ground of data-transfer into mobile broadbands and into other subscriptions. Mobile broadband subscription refers to either 1) all mobile data subscriptions productised by a company for data transfer. Some of these subscriptions can technically be used for telephony (calls, including VoLTE/SMS/MMS) but they have been sold for data-only use. Or to 2) all subscriptions productised for telephony and data transfer. The subscriptions include data transmission services that are subject a monthly fee and they can be used for traditional telephony (calls, including VoLTE/SMS/MMS) that are subject to a subscription-specific pricing scheme.
From 2H2017 onwards, prepaid subscriptions that have been used for data transfer are included to mobile broadbands.