No EOF when socket closed by mobile phone

Hi,
i have a mobile phone connected with TCP/IP to my internet server using GPRS.
When i close the server the mobile phone gets an IOException which is what i expect.
When i close the mobile application in the emulator i get an EOF on the server side socket - OK.
But:
When i close the mobile application on a real mobile phone, the server socket does NOT show any EOF - the connection remains from the point of view of the server.
How can this be?
Thanks
Marcel

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