Electricity in China!

I am a Canadian travelling to Nanning, i have a cell phone and some other electrical devices that i will need to charge while i am there. What do i need to bring to adapt to China power? Will i need a special device to convert the power from 240 volts to 110 volts Canadian. Do i need to buy special plugs? If so what kind? Can i purchase these in Canada? If so where? Can anyone explain this to me? Thank you. Surfin