My situation sounds specific although I may be misdiagnosing it. I've searched the forums and surprisingly haven't found any threads about "I hear them, they don't hear me" although as I explain my situation seems more specific. This must have come up before so I'm surprised, please let me know if you know of any. I did find a few results online but nothing helpful. A year ago I had a similar 'I hear them they don't hear me problem' but luckily I was standing next to an Apple Store. I took it in and after they used canned air in the headphone jack it worked. Seems the sensor in the jack thought the headset was plugged in so it turned off the handset mic. This time around it's a lot stranger. It's been happening a lot recently, in fact just twice the past ten minutes with the same person. But I even have the headphones on and it still doesn't work. More strange it seems to only happen (so far) when I call other iPhones...... and only sometimes. After two attempt right now I easily got through to him twice on his land line. But when I called his iPhone earlier it didn't work with the headset, with the handset, or with speaker phone.