You have to use aspect ratio instead of resolutions.
I will illustrate with an example. Let's say you want your game to play on ipad and iphone 5.
Well ipad is 4:3 ratio with 1024*768 for ipad 1 and 2 and higher for ipad 3 but we don't care. All we need is to pick a 4:3 compatible resolution.
Iphone 5 is 16:9 ratio (you can pick any 16:9 resolution BUT bigger than the 4:3 one).
Your goal will be to be sure that your layout is big enough to fit into 2 given resolution.
You have to pick the smallest resolution. Basically the smallest resolution that fit 4:3 and 16:9 without being too small and design your game for it.
When it's done you will make a condition every tick, scroll to (the center of the screen).
You will have to put anchor behavior on all the objects and stuff in order to maintain their relative position to the window.