help with sms software

[dreamdelerium]

hi everyone. if im of topic, im sorry. i dont know where else to post. im looking for assistance developing software for a wireless usb modem (Huawei model e220 hsdpa usb modem. this modem is provided by a local-in botswana africa-cell phone company. the modem uses a sim chip). i would like to create a program that will use the modem to send out sms's. i know it can be done, as the software the modem comes with, does. i just dont know where to start. ive tried to use the gsmcomm but it doesnt appear to work. does anyone know what add on's i need to use? ive never worked with com ports before and am looking for any assistance. is there something i need to request from the manufacturer (like an sdk?). if so, they seem less then helpfull so far. or do i need an sdk for hsdpa (if so, i cant find anything on the net). any insight would be greatly appreciated. thanks jason

[Hack]

is there something i need to request from the manufacturer (like an sdk?).

That was going to be my suggestion. Usually SDK come with sample code that can get a project like this kick started.