To your computer it will look like a normal modem that understands
> Hayes commands to build a connection and dial your ISP. Your phone
> will convert it to a gsm-data call. Cingular can have a different rate
> for those calls and not count it against 'voice' minutes you may have.
CSD = circuit switched data. CSD uses plan minutes as opposed to GPRS which just uses data and data is billed differently. By the kilobyte (if measured) or unlimited in some cases.