Get the originial Screen resolution, after Screen.SetResolution in mobile?

I have a setting page to allow player to set lower resolution for performance, which is save and set at game launch, using Screen.SetResolution()

At some point I want to get the original resolution, is Unity has it? E.g. somthing like Screen.originialWidth and Screen.orginialHeight.

I can have a script to cache those at the very beginning, but should be great if Unity already has it.