If you've got a Samsung Galaxy SIII or Note II, you're probably aware that it uses a special 11-pin version of the micro USB connector. If you want to use a standard MHL or OTG adapter, you will need a 5-pin to 11-pin micro USB adapter, such as this model from Monoprice!
This adapter performs the same function as the Samsung branded adapter. What makes it unique is that it adds a 6 inch length of cable, which removes stress on the phone's internal USB port.