Originally Posted by taarmen
My defy+ cable has on the mirco side two metal pins on each side. Normale cables got only two metal pins on the wider side of the mirco side.
Those aren't "pins" in the sense of providing data signals or charging current. They are more like small springs designed to improve the mechanical retention of the micro USB plug in the socket. They don't make any difference to the electrical or electronic function of the USB cable, beyond reducing the risk of a poor physical connection, or a loss of physical connection if the handset is moved which charging/transferring data.
My Blackberry charger's micro USB plug doesn't have them , but the short USB to micro USB cable which came with my noise-cancelling headphones does - and the only
function of that cable is to charge the battery in the headphones. I think you will find that there are a number of subtle mechanical variations of this kind between micro USB plugs from different manufacturers.