PowerMac 9600/300 USB Card & Samsung CDMA Phone problems

Well what i have is my PowerMac 9600 that is going to be replacing my g3 as the motherboard went cookied. I use a Samsung VGA 1000 PCS Sprint Phone as my ISP as a USB Modem. It works fine in OS 10.3 and in OS 9 it will connect, but when I go to connect to Instant messengers the entire USB on the computer stops working. jany ideas guys