> The HAM TNC idea allows for full time connectivity at a reasonable rate
> of speed with no cellular costs

Very true.

> Can you control the Ericson via the IR?

Yes you can control every function of it including updating the phonebook,
reading/deleting sms messages, dialing for a voice connection, data, fax, etc.
I use it to connect my Linux laptop to the net when I'm travelling.

Paul