a host service queues one or more data messages for delivery to a wireless mobile device , and attempts to authenticate whether a service session with the device is active . a session includes a saved login credential over a predetermined time period , where the credential was previously received and saved from a previous login . when the session is active , the host service sends the data message to the device via a wireless network . when the session is inactive , the host service sends a notification message to the router system over a previously - established connection . the notification message is subsequently forwarded by the router system to the device in the wireless network . after sending the notification message , the host service receives a new login credential from the device for activating a new service session , authenticates the new login credential , and activates the new service session for data message delivery .