Hi,
This is a security feature...
But if you are only
testing and getting annoyed by the popup on the Nokia 6600 then do this
1) Navigate to the Manager on the device
2) Select your application from the list
3) click on Options and select Settings
4) On the Network item select -"Ask the first time only"
So now when u launch the MIDlet it will ask you only once and the other connections will proceed without a popup.
For deploying such a MIDlet u will neeed a certificate as mentioned above and also add the methods that u need to the MIDlets-permissions attribute in the Jad file
hope this helps