Likelihood has it that this is referring to above Nokia model, combining PDA and mobile phone.

Right, a communicator is a mobile phone with many functions, just like a little office.

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Note added at 2002-07-17 22:53:14 (GMT)
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Take a look at the following site:
http://www.communicator.org/

There\'s an excellent explanation of communicators.

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Note added at 2002-07-17 22:56:53 (GMT)
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Definition by mob-phone:

Mobile Phone
Any Portable Handset for use in telecommunication such as voice and data and increasingly multi-media. This is the same as a Cellular or Cell Phone / telephone.

Definition by communicator.org:

[...]Mobile Phones, especially the Communicators: revolutionary handsets which broke new ground when first launched and still remain the only \"one-box\" mobile data solution for cellular networks. In addition to normal voice calls you can send and receive email and faxes and even access the web, no matter where you are in the World (when in coverage!)

I would stick with communicator, which is more than just a mobile phone (it has some additional features, thus being more a mini-computer. If I remember well, you can even send faxes, etc.). I think Nokia is the only brand that has the communicator.