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Reading among the list of possibilities of the Java ME platform, its possible for a J2ME app running on a mobile to initiate a TCP Socket or HTTP connection with a server.
On similar lines, Is it possible to form a TCP socket connection between two mobile phones?
You can open a ServerSocketConnection and a SocketConnection on the other side. This allow two way direct communication between two mobile phones. You can look at this page for some more details. But I am not sure about the security requirements and what is allowed and what is not using these classes.