I have an application which links to dll. This dll uses RSocket:pen(). I add capability NetworkServices(only one capability) in the mmp file of my exe and dll. However, when I makesis and self-signed the sis. The sis can't be installed in my device Nokia 3250. The Error messages are "Required application access not granted". I think NetworkService is in the basic capability set so that the self-sign should be okay.
Then I get the developer certifcate from Symbian signed for Nokia 3250. After I makesis and sign with that sis, the problem still persist. I can't figure it out.

Is there anyone who can help in this case? I really appreciate your help!