hello and welcome to the forum
the dll you mention is only useful on windows, it is a library specific for windows and won't work on linux
some cellphones can be set to work in a certain way, to act as a camera, as a usb device/printer, as a phone/modem or as a usb mass storage device
have you verified this option on this phone?
if this phone is only capable of act as a modem with the cellphone software suite from lg, it is not a good candidate to use on another platform, it is tied to windows afik