My cat isn't much interested in the telephone, but the computer, that's entirely a different story. I think it was bothering her to see me paying so much attention to something other than her, so she started to sit on my lap to try and divert my attentions to her. Instead of getting me to pay more attention to her, she ended up being totally enthralled by the movements on the computer screen.
She sits on my lap with both her front paws up on the desk. She closely follows any movement I make with the mouse, especially if I'm using the pointer; that seems to be her favorite. Sometimes she gets so excited that she'll jump up and touch the screen. She even loves to watch me type. Occasionally she'll put her paws on the keyboard and sorta hit the keys. I'm not sure if she's actually made a connection between hitting the keys to make some action happen on the screen, but it certainly seems as though she has.
Actually, now that I think about it, she really did get me to pay more attention to her after all. I find it so funny to watch her and I try to find things that I think will entertain her the most.