If you are talking about transfering data between phone and pc using nokia data suite, if so look at the phone models & enhancements (main Nokia site) it tells you there if the phone is data capable. The one thing it does not give much away is the hardware specs I noticed.
I was searching for a nokia with a builtin modem and after searching the net found that I needed either a nokia 5110 , 6210, 6110 or 7110 model, did end up getting 6210 "nice phone"