IPhone 3GS not charging when on the phone?

My iPhone recently started not charging while on the phone today. When I'm off the phone it fine. I do t get the same charging button when I'm on the phone. It says its charging and it's a white background with the cord button were it tells the percentage. But after I'm off the phone it's fine? What's going on?

Don't use your phone to make calls whilst it's plugged into the mains, I read a pretty nasty story the other day about a bloke who done just that and ended up dead! No joke read about it:

http://www.nairaland.com/1121075/danger-using-cellphone-while-charging

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