Once your app is signed, you need to request access to restricted APIs. In your case, add:
to your MANIFEST and your JAD. Your IDE might have an option for doing this for you (look for application properties, application descriptor editor, security settings, something like that).
Using "MIDlet-Permissions" will prevent your app from installing if the permission is not available. Change them to "MIDlet-Permissions-Opt" if you want those permissions, but would rather have an exception at runtime than not installing at all.