After asking in various forums, I have decided to ask the question
here to see if I can get a better and more detailed and definite
answer to the question I have been seeking to have answered! :

I have an Ericsson T65 mobile phone that has a built in modem (GPRS).

I am thinking of purchasing a Psion Revo (this model only, not
interested in others) and I am wondering about connectivity between
the two.

Now connectivity between PDA and Cellphone is usual done via IR or
Data Cable. The T65 has no IR port, and to my knowledge the Psion Revo
has no Data Cable port. (Is this a correct assumption).

Therefore is there any way to add a IR port to my T65? I was aware
that you could ad IR capabilities to a T28 phone via the use of a DI28
IR modem which connected to the bottom of the phone, is there a
similar device that would attach to my T65.

In addition, could I use the Psion Travel Modem with my Ericsson T65?
Somewhat defeating the object of the built in modem on the T65, there
must be a cable to allow connection between Cellphone and Psion.

The only option if this proves fruitless is for me to reluctantly
change my phone for a T39 - Ericsson cheapest IR and GPRS phone. (I
would not consider a non Ericsson phone).