A system for generating mobile telecommunications network access selection data for a mobile telecommunications device user, the system including: first receiving means operable to receive mobile telecommunications device properties information wherein the mobile telecommunications device properties information includes one or more technical features of the device; second receiving means operable to receive mobile telecommunications network access properties information relating to one or more mobile telecommunications networks; and network access selection data generation means operable: to automatically generate mobile telecommunications network access selection data for the mobile telecommunications device to access at least one of the one or more mobile telecommunications networks, wherein the mobile telecommunications network access selection data provides a plurality of options for mobile connectivity for the mobile telecommunications device via the one or more mobile telecommunications networks, wherein the mobile telecommunications network access selection data is derived from the mobile telecommunications device properties information and from the mobile telecommunications network access properties information, wherein the mobile telecommunications network access selection data is based on the one or more technical features of the device, and to provide mobile telecommunications network access selection data to the mobile telecommunications device user for selection. first receiving means operable to receive mobile telecommunications device properties information wherein the mobile telecommunications device properties information includes one or more technical features of the device; second receiving means operable to receive mobile telecommunications network access properties information relating to one or more mobile telecommunications networks; and network access selection data generation means operable: to automatically generate mobile telecommunications network access selection data for the mobile telecommunications device to access at least one of the one or more mobile telecommunications networks, wherein the mobile telecommunications network access selection data provides a plurality of options for mobile connectivity for the mobile telecommunications device via the one or more mobile telecommunications networks, wherein the mobile telecommunications network access selection data is derived from the mobile telecommunications device properties information and from the mobile telecommunications network access properties information, wherein the mobile telecommunications network access selection data is based on the one or more technical features of the device, and to provide mobile telecommunications network access selection data to the mobile telecommunications device user for selection. to automatically generate mobile telecommunications network access selection data for the mobile telecommunications device to access at least one of the one or more mobile telecommunications networks, wherein the mobile telecommunications network access selection data provides a plurality of options for mobile connectivity for the mobile telecommunications device via the one or more mobile telecommunications networks, wherein the mobile telecommunications network access selection data is derived from the mobile telecommunications device properties information and from the mobile telecommunications network access properties information, wherein the mobile telecommunications network access selection data is based on the one or more technical features of the device, and to provide mobile telecommunications network access selection data to the mobile telecommunications device user for selection.