Using the modem with other ISPs? (Score 1)

Hello! I'm not clear from reading the posts, if after installing a new OS if you will be able to log into your regular ISP (earthlink, etc.) via the built-in modem? I thought there was some discussion that the modem is not standard and would not work? Is this correct? Is the modem still a mystery? I have one on order at CC. and today I got my Mother to order 2 more. I better be able to get this hack to work or I'm in deep water:-) Thanks Jerry