Differences between 3G and 3GS iphone? [closed]

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I know it is a silly question. But, i cant gather more informations about this. I want to know the difference between 3G and 3GS iphones. Mainly is iphone 3G supporting Background process, Multitasking and Push Notification features? Can any开发者_运维百科 one clarify my question? Please help me. Thanks.

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iPhone 3G:

• Background processes: NO
• Multitasking: NO
• Push Notifications: YES

iPhone 3G S (running iOS 4+):

• Background processes: YES
• Multitasking: YES
• Push Notifications: YES