Midlet Running in the Emulator but not in the phone?

Hi everybody,
I have developped a Midlet using the Sun Wirelees Toolkit, the midlet reads results from a Servlet and print it on a TextBox. It works fine in the emulator but when I deployed it to Nokia 6600 it prints NULL.
I really don�t know what�s the problem. Bytheway I used thread for sending data from Midlet to Servlet.
Any Suggestions:) ?
Thanks for your time and interest,

I suggest that you find out what the problem is ;)
Really, we can't smell whats wrong. It could be lots of things...
Try to de bug the application on the device. The "best" way is to use System.out.println statements, of use a textbox to print the messages. Than check where it goes wrong, and why..

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