I and my wife both are having same models mobiles i.e. Nokia 2100, I am very sure ,that she is receiving calls from her friend, so I only wish to monitor the call Nos.she dials and received,on her cell. So I can track the nos .through my cellphone and I will get the intimation on my cell whenever she dials and received the call.

Hi,
Have you called your cell phone Customer Service toll free number?
If the representative can't answer your question, ask for Tech Support.
This is a question for them.
Cell phones vary in what they can do.
Happy Holidays,
fredg