The B000YE54F8 2.5mm to 3.5mm Stereo Audio Headset Adapter for Apple iPhone is a piece of .99 cent junk. I know it’s junk, because the identical pair I bought a year ago have both broken (APLIPHONEHFA2) and there’s no reputable reseller of any variant of these devices.
I also know that before they came apart, my adapters worked.
This is curious.
There’s clearly a lot of demand for a product that allows one to use an older high-quality headset (2.5 mm) with an iPhone (3.5 mm). Lots of people who’ve spent $50 or more on headsets are taking a flyer on buying this, and that market is not going away. (Really, Bluetooth sucks. And even if it didn’t, why spend $100 for a decent Bluetooth headset when you already own a great high end headset that doesn’t burden the iPhone’s hurtin’ battery?)
So why doesn’t a company like Griffin sell a decent adapter for, say, $20 for a pair? I suspect good ones would cost $2 to make and package, so we’re talking a pretty sweet profit margin. It’s not like Griffin has a line of Bluetooth headsets they need to protect.
That’s the mystery.
Of course I have a theory.
I suspect Apple has a patent on the layout of the iPhone’s headset connector . The license fees are probably wicked, or even unavailable. Apple does sell Bluetooth headsets. The cheapo vendors are dodging the licensing fees, and Apple can’t be bothered to go after them.
Any other theories?
 Yes, I also used to think these layouts followed some kind of standard. That was before I experimented with various AV connectors. If there is any kind of standard manufacturers don’t follow it.