From Forum Nokia Wiki

this code not work for series 60 2nd FP3 (always return blank number) ... I hink problem here : // Get call info. We need call's name to open it and get the info we need const TInt KCallIndex = 0; User::LeaveIfError(line.GetCallInfo(KCallIndex, callInfo)); may be must use call index not equal to 0?

P.S. i think on series 60 2nd FP3 we can use CTelephony...