Does the iPhone switch to 3G in sleep mode?

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I’ve got an iPhone 4 and recently I have noticed something…every time I unlock my phone and wake it from sleep mode (usually after a long period of time) and if I’m using a Wi-Fi connection, the 3G logo appears before quickly changing to the Wi-Fi symbol. Does the iPhone switch to a 3G internet connection when it goes to sleep? If so, is there any way of keeping Wi-fi connected during sleep mode? Thanks in advance for your answers :)
Thanks Ali Bahal for your answer, but this only activates the internet which I already use. I’m looking for a way to keep wi-fi connected when the iPhone is in sleep mode, if this is not the case.

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