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how to programmatically start 3g connection on iphone?
do I need to use socket api?
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The iPhone SDK abstracts out (in most cases) your connection type. You cannot choose to use wifi vs 3G vs EDGE vs Bluetooth. It might be possible if the device is jailbroken, but it's not in the SDK.
As far as I'm aware, the only time you can explicitly use a certain kind of connection is when using the GameKit framework and it forces you to use a Bluetooth connection.
You don't need to. You just access whatever resource you need from the Internet, and the phone will handle connecting in a suitable manner. If you want to know whether there is a connection at all, and if so what kind is being used, there is an API and a sample from Apple. Also see Apples iPhone Network Access: Best Practices.
You can't programatically start a 3g connection.
You app should be aware of the network status whether it be EDGE, 3g or WiFi.