Sennheiser MM50s with iPhone - can't get the voice button to work :(

I bought a pair of these myself a couple of weeks back. They work great, including the button on the microphone.

However I've had a couple of times when this has proven a bit recalcitrant. In my case unplugging and plugging in again - making sure to push home fully - fixes it. The connector is very sensitive to not being all the way in, it seems...

Sorry if my answer confused.

I don't mean you need to use excessive force to push it home, but I do need to make sure the connector is all the way in and that it's easy to leave it nearly-but-not-quite home, and when that's the case the mic button doesn't work.

I've just tried quantifying it. From the front of the iPhone, when the headphones are all the way in there's no more than 0.5mm of gold connector showing. But with as little as 1.0mm showing, the mic button doesn't work, although sound does in both ears (and sometimes it's louder than normal too).

(Because of the curve on the iPhone, there's a good 1-2MM of connector showing at the back even when fully inserted)

If you're confident the connector is as far in as it'll go without damaging something, then it sounds like you've got either something in the connector slot of the iPhone or duff headphones. Do the buttons on the stock iPhone headphones work for you? That would narrow down the problem for you...

PS: you don't need to push-and-hold; that launches Voice Control. A short but confident stab should play/pause; two quick pushes will skip a track, and 3 quick ones will go back to the start of the current track or go to the previous track if you were already near the start. I found the button on the MM50s a bit un-ergonomic in position and operation to start with but I'm getting more confident with knowing I've hit it now. There can be a 1-2 second delay between hitting the button and getting an effect though.

OK, I can't come up with any sort of scenario where only 1 headphone is affected that isn't a fault in the headphones.

If the iPhone ones work, I think you'd be better off seeking replacement MM50s or a refund, because they sounds knackered to me...

my apple headphone (volume buttons) is not working either. I restored my iphone and lost my songs. But it did not help.

Crazybo - Your problem sounds like it might be crud in the iPhone's socket, or a broken pin in the socket. Either way, sounds like a job for AppleCare or a Genius at your closest store to me...

I had a similar problem with my Bose headphones in that the sound was fine, but the button did nothing. Turns out there was a giant lint ball in the socket. The Apple Store folks were able to blow it out with a can of compressed air (aka keyboard cleaner). Turns out this is required on a fairly regular basis. I also read on another post that blowing air around the sleep/wake button can get it working again (haven't tried that).