Some were just for one earphone (mono) and a mic. Some were effectively the same as the iPhone (stereo+mic). Some had weird adapters for other ports if they jus

Some were just for one earphone (mono) and a mic. Some were effectively the same as the iPhone (stereo+mic). Some had weird adapters for other ports if they just had the earphone+mic version. I think I had one of each at different times, all pre-2007.