My iphone4 have leakage current phenomenon,design problems?

When my iphone4 charging with the data cable
It often electric shock me
Not always so
Especially the headphone jack、mute switch and metal antenna
why？
The design problem?
How to solve?

When using the supplied Apple charger do you have any problem? The apple supplied charger has a very low leakage current of about 30uA when connected to the phone.
If you connect your phone to a PC or Mac and you get a shock this indicates the leakage current of the connected device must be high, it does not indicate a fault with the iPhone!
Sometimes the design of a power supply means you may feel a shock for a moment when contacting the metal parts, but this is more like a static discharge effect as the power supplies internal capacitances discharge. If the tingle sensation continues you may have a higher than normal leakage current form the mains power supply.
Given you mention you have a notebook (PC non Apple I assume) then maybe your power supply is not as good as it should be. Try to measure the current between the metal chassis of the power supply and earth using a amp meter (multimeter set on mA). For a class II double insulated power supply there should be less than 250uA (0.25mA). For an earthed, class I, power supply it should be less than 3.5mA.
If it is an earthed power supply and you get a shock then either the earth to the power supply has broken or your mains outlet (or entire dewling) may have no earth! If so call in a professional electrcian ASAP!

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My iphone4 have leakage current phenomenon,design problems?

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