Driver for Ericsson HM121dp
I searched the internet but find no luck.
Without it I cannot get on internet under linux...

Do you have the option of using a network cable to connect your modem to your computer?

A network cable? what is that?
So does it mean do not use usb to connect with the computer?

Yes it does, but your modem may not support that option. If it does, there will be a port on your modem that looks like a phone jack, but is a little bit bigger.
Noah

There is not that cable port on my modem....
but thanks for ur help.

Same modem here. Ericsson isn't giving drivers and my isp isn't giving linux support for this. Worst thing is, the modem isn't being giving out anymore by my isp, so I doubt it there will ever be linux support/drivers

You may be able to trade your modem in, and get a new one. It doesn't matter if your ISP supports linux or not, we will be able to get you on the net if you have a linux compatible modem. The modems that are the easiest to set up, are the ones that connect to your computer via network cable. (you don't need a driver for those.) However, you must have a network card in your computer.
Noah

That's my problem, my isp doesn't do drugs, errr trading :P

If you are will to spend a few bucks, go to www.ebay.com and search for 'dsl modem', you will get plenty of results.
Noah

The modem using a cable?
Do you mean ethernet modem with an ethernet card?

I do have one but both the card and the modem need to be installed. I haven't tried if I can get the drivers of them, but the model of that modem is also strange and not popular in the market. @_@

I'm not sure if we are understanding each other. I will just tell how I am connected using linux. I have my computer set up on my desk, with the dsl modem right next to it. I have a network cable running from my computer to the modem. Of course the modem need power, so I pugged it in. And since dsl needs a phone line, I ran a phone cord from the modem to a phone jack that's behind my desk. And best of all, no driver needed.
Hope this helps, Noah

Em...seems the same as my ethernet modem...
ethernet card is where your cable get connet with ur computer, it can be inside the computer or can be a separate one. Maybe linux have the driverit itself so you don't have to install and it can be used automatically.
I only need to set the ip address when i use that modem under winxp but I think maybe i need a driver for linux.
My laptop is rather strange and many of its hardwares need a special driver, even the monitor...
but anyway, solving problem is a way of learning for me. ^-^

btw, thax again.

Try opening up your browser, and type the ip address in the bar. Then follow the same steps that you use for windows.
Noah