@Douceptrop '

Take a trombone and dissect the slightly.Scratching with the bottom of the socket, and you will go out of the dust.A lot of dust.To rub, you plant the trombone on one edge at the bottom, then you slide it towards the other edge, then you pull the dust out of the connector.You have to do that several times until there is no more dust.This is how I do it, and it works well!

Otherwise, I just replaced the battery of my 6S for 40 €.At first, it's not the big surprise apart from the phone that is more stable, and the level of the battery too.But once the drums of the battery took place (it takes about one at two weeks, it's impressive, it completely changes your life!