A method of communicating messages between subscribers to an electronic messaging network, comprising the steps of: maintaining, at a network operation center, a first file of canned messages and message codes respectively assigned to the canned messages; maintaining at a first terminal of a first subscriber, a second file of canned messages and message codes corresponding to the first file; maintaining, at a second terminal of a second subscriber, a third file of canned messages and message codes corresponding to the first file; selecting an appropriate canned message from the second file for transmission to the second terminal; sending the message code assigned to the selected canned message to the network operation center; relaying the message code assigned to the selected canned message from the network operation center to the second terminal; retrieving the selected canned message from the third file using the assigned message code received from the network operation center; and displaying the selected canned message retrieved from the third file. view more

A network operations center for transmitting and receiving messages to and from a wireless mobile unit comprising: means for transmitting messages to the mobile unit; means for receiving acknowledgment messages from the mobile unit; means for determining whether an acknowledgment message is an acknowledgment to a data message or an acknowledgment to a probe message; means for transmitting a probe message to the mobile unit if, after transmitting a data message to the mobile unit, no data acknowledgment message is received; and means for marking a data message as undelivered and storing the undelivered data message if, after transmitting a probe message to the mobile unit, no probe acknowledgment message is received. view more

In a two-way wireless communications system, a method of processing data messages that cannot be successfully transmitted from a network operations center to a wireless mobile unit comprising the steps of: (a) transmitting a data message from the network operations center to the mobile unit; (b) receiving at the network operations center a data acknowledgment message from the mobile unit acknowledging receipt of the data message sent by the network operations center; (c) transmitting a probe message from the network operations center to the mobile unit if, after transmitting a data message to the mobile unit, no data acknowledgment message is received at the network operations center; (d) marking at the network operations center a data message as undelivered if, after transmitting a probe message to the mobile unit, no probe acknowledgment message is received at the network operations center; and (e) storing at the network operations center the undelivered data message. view more

A mobile telephone paging call back device comprising: means for receiving a page message including a call back number; controlling means for determining an appropriate prefix to be added to the call back number in accordance with a system identification number (SID); and means for displaying the call back number with the appropriate prefix. view more