Optimizing game for iPhone 6 vs 6+ vs Samsung Note vs Samsung S5

Hey guys,

How would I optimize the boundaries of my game for different phones with different resolutions? For example, when I test my game on a Samsung S5 the camera position is perfect, where as when I test it on my Note 3 it shows a bunch of stuff that's out of the boundaries which should not be seen! I have to edit my camera position in order to hide these things for whichever phone I'm on.

Is there an easy way to optimize my game for all phones at once, or do I have to change it for each resolution? My game is complete, but I would like to know this info before I release it to the Play/Apple Stores!

Thank you so much!