It was a Nokia 7110, even today a cool phone with that sliding cover to answer or end a call. Known from the Matrix movie, although they used a slightly older Nokia model there.
I have to say in general I kind of miss the old times. Phone designs were a lot more creative and interesting. Today it's just always a big glass surface inside a shell, sometimes metal, sometimes plastic, yet devices look more and more similar. Thinking back to designs like Nokias Communicator series, the BlackBerry Bold 9000 or Flip, Palm Pre or even some HTC designs like the Touch just shows how different phones could look back at that day.