In order to enable a home network operator to also control the issuing of certificates to a roaming subscriber, first information indicating whether or not it is allowed to issue a certificate to the subscriber is maintained in the subscription information. The present invention comprises an input device, a tilt sensor, a motor, a microcontroller unit, and at least a laser module. The invention further features methods of identifying antibodies or antibody fragments with broadly neutralizing activity against HIV. The power supply drives the device as the pile is driven into the substrate. A token is generated when the subscriber either selects the service, if pre-authorized, or when the service is purchased on impulse.