A wireless network access method performed by a subscriber device subscribed to a home mobile network, a wireless local area network, and an authentication system, the method comprising the steps of: in a once-off registration phase: the device sending registration data in a mobile originating short message via the home mobile network to the authentication system, and the authentication system performing a query to said home mobile network of the subscriber to validate the subscriber and resolve the subscriber and device identifiers, and the device receiving wireless local area network access information from the authentication system, said network access information allowing the device to generate network access credentials for subsequent network access; and in a wireless local area network access phase: the device generating network access credentials using said network access information previously received from the authentication system during the registration phase, and wherein: during the network access phase the device automatically discovers a preferred WLAN service, and the discovery is performed using network selection data included in the network access information, and wherein the network selection data includes service set identifiers, SSIDs; wherein the network access credentials are not stored, being algorithmically generated for every network access. in a once-off registration phase: the device sending registration data in a mobile originating short message via the home mobile network to the authentication system, and the authentication system performing a query to said home mobile network of the subscriber to validate the subscriber and resolve the subscriber and device identifiers, and the device receiving wireless local area network access information from the authentication system, said network access information allowing the device to generate network access credentials for subsequent network access; and the device sending registration data in a mobile originating short message via the home mobile network to the authentication system, and the authentication system performing a query to said home mobile network of the subscriber to validate the subscriber and resolve the subscriber and device identifiers, and the device receiving wireless local area network access information from the authentication system, said network access information allowing the device to generate network access credentials for subsequent network access; and in a wireless local area network access phase: the device generating network access credentials using said network access information previously received from the authentication system during the registration phase, and wherein: during the network access phase the device automatically discovers a preferred WLAN service, and the discovery is performed using network selection data included in the network access information, and wherein the network selection data includes service set identifiers, SSIDs; wherein the network access credentials are not stored, being algorithmically generated for every network access. the device generating network access credentials using said network access information previously received from the authentication system during the registration phase, and wherein: during the network access phase the device automatically discovers a preferred WLAN service, and the discovery is performed using network selection data included in the network access information, and wherein the network selection data includes service set identifiers, SSIDs; wherein the network access credentials are not stored, being algorithmically generated for every network access. during the network access phase the device automatically discovers a preferred WLAN service, and the discovery is performed using network selection data included in the network access information, and wherein the network selection data includes service set identifiers, SSIDs; wherein the network access credentials are not stored, being algorithmically generated for every network access.