
codeproject.com/Articles/120638/3G-Modem-Internet-Dialer
Introduction
A wireless 3G modem is a type of modem which connects to a cellular network instead of to the land line telephone system. It allows you to get broadband internet access anywhere you can get a cell-phone signal. Many cellular phones these days have 3G modems built into them.There have been a lot of great articles that guide you how to write an internet dialer for regular modem (and most of them work for 3G modems too) but some information is missing, for example, signal strength, connection mode (GSM, GPRS, EDEG, HSDPA, etc.) and other information which is wireless modem related.
Background GET FROM HERE
All work and testing was on a Huawei modem, but things shouldn't change much with other modems. Before we get started, you need to successfully install the modem, and you should notice after installing the modem that it usually adds three ports: one for the modem and the other two for application interface. In my case with a Huawei modem, you should see the following in the device manger:
Under Modem
HUAWEI Mobile Connect - 3G Modem
Under Ports
HUAWEI Mobile Connect - 3G Application Interface (COM #)
HUAWEI Mobile Connect - 3G PC UI Interface (COM #)
We are only interested in two ports: the "Huawei Connect - 3G Modem" port which is the modem port where normal connecting and disconnecting commands should be invoked (RAS should do this for us), and the "HUAWEI Mobile Connect - 3G PC UI Interface" port that the modem uses for sending events like signal quality, signal mode, etc.
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