Fixed the volume and dock connector on my iPhone 4.
45 minutes - 1 heure
Fixed bad volume down button and port connector.
Very hard install on the volume control. If you are not comfortable with the very small parts do not try.
Utilize some type of glue to help stick the tiny parts together besides the adhesive they come with.
iPhone 4 (GSM/AT&T) Dock Connector
iPhone 4 (GSM/AT&T) Headphone Jack & Volume Control Cable