iPhone 3G vs iPhone 2G

I like apple iphone now i am planning to buy iphone but before that i want know what is the difference between iPhone 3G vs. iPhone 2G ? I want know that iphone 2G supports wifi or not ?

Thanks

MMS: Send messages with text, video, photos, audio and contacts with the Messaging application that replaces the SMS application. iphone 2G is not support media messages. where in iphone 3G media messages service available. The MMS option should be added depending on your package. Sending a video by MMS is not available on iPhone 3G.

iPhone 2G you cannot use as modem like Other phone such as nokia N series and latest phone. Modem Internet connection sharing available with 3G iPhone on your Mac or PC. The option must be added depending on your plan.

The notification messages PUSH: some applications of the iPhone will stay connected at any time and send you text alerts to notify or audio events or news, for example: sports alerts, facebook. This application available on iPhone 2G and iphone 3G but for this you requires a broadband internet access. VGA video recording is not available on iPhone 2G and iphone 3G.

You can download TV series, music videos and audiobooks from the iTunes Store on iPhone 2G and iphone 3G but you require Wi-Fi. The 2G iPhone was released in 2007, the iPhone 3G in 2008.