A wireless communication system, comprising a host service, a wireless router system coupled to the host service, a wireless network coupling the wireless router system and a wireless mobile communication device (“mobile device”), adaptively delivers data to the mobile device in the wireless communication system.In another embodiment, a receive trigger is used by the host to initiate a session where messages are delivered to the mobile device. The host trigger consists of the receipt of a message from a host. Upon detection of a session, messages are sent to the device. If a session is inactive, login credentials are requested. Detection of a logoff trigger from the mobile device will terminate an existing session and current login credentials are also expired.