Nokia AD-61 Audio Adapter
Simply plug the 2.5mm jack of the adapter into the 2.5 mm audio jack, and the other end permits you to plug in your universal 3.5mm headsets for stereo audio. Compatibility includes the following Nokia model phones: Nokia 5100 5140 6085 6126 6230 6800 7270 9500 N70 N71 N72 N73