I have one of those samsung headphones that also have a mic to use on cell phones during calls. But I notice that if I use this headphone on my 3DS, the 3DS's built in microphone won't work. Instead, the 3DS's listen to my headohone's mic as it was my cell phone. I would like to share this information, since it may be useful as you can use any headset that uses a 3.5mm jack.