|I looked at the 3 mobile web site and I found no evidence that the software supports being installed on ME and below - 2000 and up, yes. |
Win 98 has no built in support for recognizing the USB device you're plugging in. It doesn't have built in support for recognizing a lot of other USB devices as well, such as flash drives.
There are generic USB drivers available you can load, but that won't help if the software can't work in Win 98, and that won't likely help 98 recognize the USB adapter.
Which Win 98 do you have ? The original version, or 98SE ? There's even less support for devices for the original Win 98.
If you're not sure, RIGHT click on My Computer, Properties - whether it's Win 98 or 98 Second Edition is shown on the first screen you see.
Do you have other computers you could connect the 98 computer to via a router or network switch box or hub in a local network, that have 2000 or above installed on them? If so, you could share the internet connection the other computer(s) has (have) with the 98 computer over the network - if they don't have an internet connection you could install the 3 mobile USB adapter on another computer that has 2000 or above and then share the internet connection over the network on the 98 computer.