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Microsoft® Mobile Development Handbook by Peter Foot, Daniel Moth, Andy Wigley

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Making Voice and Data Calls

Data connections such as ActiveSync and WiFi are essentially always on as long as their hardware is activated. If you want to use a telephone network to send data using GPRS, CDMA, or Universal Mobile Telecommunications System (UMTS), you must programmatically establish a connection when required. If you use an HttpWebRequest or use Web Services code, the Microsoft .NET Framework runtime will attempt to establish an Internet connection for you automatically; when using lower-level networking technologies, you must create the connection yourself. Similarly, if as part of your application you want to initiate a voice call for the user, you must know the appropriate native APIs to call because the Microsoft .NET Compact ...

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