Radio communications is performed within a mobile telecommunication network. Billing related information is obtained by radio-physical detection. Within a trusted execution environment, a challenge known by the mobile telecommunication network is obtained; billing related information is received; billing related information is attested; and the attested billing related information is caused to be sent to the mobile telecommunication network.

The present invention provides a method and system for trading exchange to facilitate local data services for roaming users. The trading exchange includes an ecosystem of a plurality of operators, having home network (HPMN) and visited network (VPMN) operators. The trading exchange further includes a gateway for facilitating local data services for users, where the user is roaming in VPMN, by configuring a Domane Name Resolution (DNS) of the VPMN's Gateway General Packet Radio System (GPRS) Support Node (GGSN) for its users. The trading exchange further includes an interface maintaining a bi-directional connection with the gateway to exchange information related to the roaming services, and a bi-directional connection with users via their mobile devices' user interface.