Changing icon for toggle menu button

Currently, I have menu button for toggle purpose. User can switch between original web view, or striped down mobile view.

Currently, we are in original web view

On action bar, I'm showing a phone icon, which is used to tell user, "By clicking on me, you are going to switch to mobile view"

On action bar, I'm showing a web browser icon, which is used to tell user, "By clicking on me, you are going to switch to original web view"

I was wondering, for a toggle button, should the icon telling

What will be the next state if user clicks on me?
- A phone icon indicates if user clicks on me, view will switch to mobile view.
- A web browser icon indicates if user clicks on me, view will switch to original web view.
OR, should the icon used to indicate what is current state?
- A phone icon indicates current state is mobile view.
- A web browser icon indicates current state is original web view.