How to disable GPRS/Edge Automatic Connection

My iPAQ connects automatically to GPRS/Edge if it detects that the WiFi being used is no longer available. I have a big problem with that since it stays connected unnoticed for long periods of time and my invoice had grown significantly.

Once it has automatically conected, I disconnect GPRS/Edge and after a few seconds it tries again to connect until I have to do a soft reset. It's a nightmare!

Is there a way to disable this automatic connection or to configure it to never dial a connection? Please help!!!

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