I know how to check the messages, I had a message once someone helped me and I took notes.
I know how to make a call, that is about the only thing that can be done by pushing one button :P
I you call me, but if I am not the person you want to talk to, I cannot transfer you to someone else. "I could try , but I really don't know how it works, so I might hang up, maybe you should call back" - this is the truth, but has only happend once.
I remember my first programming job, I didn't have a phone and I liked it.
p.s.
If I don't count my girlfriend calling, I get an average of about one call a month.