I made an application in j2me and ported in Blackberry, the app is running properly in 8520, 8220 but in 9300 is not working. I debug the code and found out that http 400 error while calling the web-service APIs, the same thing i have done in 8520 its working properly with http 200.I don't know what's the problem.I tried to run an app in simulator its working fine, also tried to sign an application but its not working in 9300.

Kindly provide me solution, if you have.

You need to look in the Developer section.