try (as root)
lspci -v or lspic -vv
keep in mind your laptop's modem is more then likely a soft modem or 'winmodem'
that is to say alot of the critical hardware is not present and is emulated by the software, which is usually proprietary and windows only
if you have a winmodem you may or may not be out of luck
you can find more information about winmodems and linux here