Just one more bug on my Nokia 6280 - MIDlets do not use the same default access point settings as the browser in it.
Even though it is possible to access the Internet through GPRS using integrated browsers , HTTP requests cannot be made in the application. The device asks if the Java application should be allowed to access Internet upon running it, and then it gives a message saying “No GPRS connection available” when an attempt is made. Solution is simple - ask your users to create separate settings for MIDlets:
Menu -> Settings -> Configuration -> Personal config. settings-> Add new
Then Select “Access point” from the displayed list. Keep the default settings as they are for the newly created access point.
Now again go to Menu -> Settings -> Configuration -> Personal config. settings. Press options and then select activate.
Now the MIDlet will be able to make an HTTP connection.

I work now on some j2me application.  This application uses sockets. I have found out many devices not having sockets support though, that in specification of device sockets support are market as present.
Here the list of phones with a problem in sockets support (J2ME), it can be useful to whom that :

Nokia 3650 (flawed Socket support)
Nokia 7210 (missing Socket support)
Nokia 7250 (missing Socket support)
Nokia 7650 (flawed Socket support)
Nokia N-Gage (flawed Socket support)
Siemens SX1 (flawed Socket support)
Sony Ericsson T610 (missing Socket support)
Sony Ericsson P800 (missing Socket support)

It is checked up on many phones in each of series (my personal sad experience)