Are you asking as a buyer or seller?
If you're asking as a buyer, you can reference available info on OS versions and filter your results by phone model. This is much easier with Apple since only Apple devices use Apple OS. Will require an extra step or two for Android devices.
iOS Compatibility here.
Because many brands use Android OS you'd need to look up the brand / phone to determine OS compatibility and compare that to Android version history here.
For sellers it would be near impossible to keep listings updated as new OS are constantly released.
