Fullscreen issues

So right now as I am working on a game I have an issue. I eventually want to port it to phones and I am worried about the screen size. How do I create the screen size so it is right for all phones?

Also in XNA i used to be able to run full screen like:

this.graphics.IsFullScreen = true;

but it doesn’t seem to work in MonoGame.

Any advice on screen sizes or porting to phones would be helpful.

Thanks, Jake

Please, keep patience. We already working on that problem.

ahh thank you for this information