Bluetooth connection between the Palm Tungsten T and the Ericsson T637 via Palm Phone Link is not possible. There are no available drivers for the T637.
Because of the unavailability of the Palm Phone Link drivers for the T637, one can't use the phone as a GPRS modem to send and receive e-mail, browse the Web and go out to the internet with the Palm.
An email from Palm support says:
I am really sorry to say that there are no phone drivers available at this moment that is compatible with the Sony Ericson T637. Our developers are working upon the issue and we hope to come out with the drivers soon. So I would advise you to please keep in touch with our website so that you can download the drivers as soon as they are released.
Ericsson Online support email says:
We do not at this time supply drivers for synchronization or connectivity with palm. We only supply drivers for connection between your phone and PC. Please contact the palm company's to see if they will provide support drivers for these phones. This is something that is not supported, but is definetly being discussed.
The last update of the Palm Phone Link drivers were on March 31, 2004 http://www.palmone.com/us/support/downloads/phonelink.html so, hopefully new drivers for newer phone would come out soon.