I have been able to connect my Compaq iPAQ to an Ericsson T28 Dual band (GSM) phone using the Irda port (I also use RedBook software on the Ipaq to synchronize Outlook and my phone contacts). The good news is that it works perfectly, but DO keep the phone as close as possible to the device to avoid a break in the link. The bad news is that the first modem I had stopped working (I am pretty sure it was the connection between the phone and the modem, as the connection was intermittently functional). However, I replaced the modem about 4 weeks ago and was able to use it everywhere....including while travelling on a coach through Italy! My service provider is Powertel and I pay 5 bucks a month for a data line connection, and that gives me 9600bps, though it actally seems to be faster than that (the connection between the modem and the Compaq is in fact set at 38kbs right now). In summary...it works, reliably.A tip...I use velcro on the modem to keep it attached to the outside of my T28 holster, and I have Velcro strips in the back of a notebook I use to keep both the Ipaq and the phone in close, stable contact with each other. This arrangement works a dream, and is very convenient.