How To Resize Sprite GameObjects To Fit Different Resolutions?

I want to resize some sprite gameobjects of mine, but I'm not sure how to do it. By resize I mean resize according to the game's screen resolution. So right now I can see my sprite perfectly fine on a iPhone 5 Wide (16:9), but if I go any smaller my sprite get's cut off. So how can I resize my sprites or move them to fit according to the screen size? Please help if you have the time.

By the way, the sprite gameobjects are simply empty gameobjects with sprite renderers on them.

 

Sounds like you'd be better off scaling the whole scene to fit your screen. The easiest way to do that is via the camera's orthographicSize property.

http://docs.unity3d.com/ScriptReference/Camera-orthographicSize.html

 

Also here's many tips for sprites (including working with different viewport sizes)