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Push Message/ Notification to mobile device

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I am developing messaging application between PC (using Servlet) and mobile phone (using J2ME), with HTTP protocol via GPRS.
I has a problem in send notification to client when they got a new message.
I just test at emulator J2ME WTK 2.0. I use the ServerSocket fiture to create the client address (urlclient and port number) and run successfully.

But, when I test to Motorola C381 apear an error message,

java.lang.IllegalArgumentException: No port number in

What wrong?

Does posible implement the ServerSocketConnection to the mobile device?if posible who has authorization to create url address of every hand phone/ mobile device?

I'm still confusing about it?
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