how to make a gameobject be positioned according to screen (on edge of screen)?

Questions & Answers
1

I have a Game object that I have positioned on the edge off my game screen but when I put the game on my phone it changes its position. is there another way to keep the position of a game object to match screen size?

2

Unity: Script Reference – Camera.ScreenToWorldPoint

Here’a another question that is very similar:
http://answers.unity3d.com/questions/1113483/how-do-i-get-the-world-coordinates-of-the-top-left.html#answer-1113516