No they don't. That's why most Android earbuds only have play/pause and not volume. The volume is implemented inconsistently on different phones. I did research

No they don't. That's why most Android earbuds only have play/pause and not volume. The volume is implemented inconsistently on different phones. I did research into earbuds for my Windows phone a couple years ago and learned that manufacturers were inconsistent. You could get earbuds with volume control for the Samsung Galaxy and they wouldn't work on LG devices. The same mess applied to Windows phones.