I can for sure say that I have a Philips DC320 clock radio that I bought to work with my iPhone 3G, silly me for thinking that Apple would allow the iPhone 4 to work with it. It says this device is not supported!! So I am not sure what speaker docks, clock radios, etc.. will work with iPhone 4. So basically the best advice anytime a new iPhone come out, plan on buying a new speaker dock/clock radio. It sucks!!!