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That's interesting as most people would likely want the opposite. In either case, Tasker can easily do this for you.
Sorry, couldn't resist.Do you live near a nuclear plant?Sorry, couldn't resist.
You might look at: Shake Toggle for Android | AppBrain.com
But I wouldn't be surprised that if you got a call on 3G and you disconnected 3G, that you'd lose your call.
Am i missing something?

once i am answering a call, the app itself will close the wifi and the 3G (in order to reduce radiation near my ear)


He has a valid concern. Se Electromagnetic fields from mobile telephones could possibly lead to cancer
Currently EM fields from telephones are in the same category as caffeine or solar radiation