TW> I brought an oem usr 33.6 modem last year..  I checked 3com's
 TW> website today and found that they set up something called itu
 TW> upgrade helper..  the modem I brought didn't have a box so how
 TW> I find the serial #? I need the serial number to find out how
 TW> to upgrade my modem to 56k(itu-t standard).. and I believe
 TW> they need my modem's serial number if my modem need to be
 TW> upgraded physically by exchange a 56k modem.
if it is an internal modem, you need to open the machine and pull the modem 
card out to see the serial number sticker. it is located on the black RJ11 
phonejacks.
however, in my experiances with oem'd usr modems, it is up to the oem to 
supply the upgrades and such... the company i used to work for ran into this 
very problem with the X2 upgrades... we were told that we had to supply the 
X2 upgrade stuff but then we were unable to find where to get that needed 
material to supply our customers. needless to say, we dropped selling the oem 
modems.
good luck and best wishes no matter what you find out...
)\/(ark
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