I have a Socket 56K CF MODEM and it worked until I upgraded to the ROM v1.2X series. Not sure what changed but the MODEM is not recognized anymore and I tried it on a laptop to make sure it was not burned out. Now my MODEM doesn\'t work in BOTH ROMS, Qtopia v1.2X and pdaXrom v1.05 where it never worked (unrecognized)... anyway, the ROMs are works in progress and both have come along way!