I'm designing my app (targeting only iOS/iPhone devices).

I'm struggling to make up my mind on something.

Currently, there couple components, which i'm designing to fit into iPhone 5 screen(smallest screen). On largers screens(iPhone 6, 6+), i'm centering the components and just give it more margin from the sides.

Notes

In all of the images, the "red" area is at the same size(width and height), only the screen size changes

Should i or should i not increase the size proportionally? Is there are a known guidelines? Should i keep the font size and only increase the images?

Thank you! :)

Example:

I'm designing my app (targeting only iOS/iPhone devices).

Currently, there couple components, which I'm designing to fit into iPhone 5 screen(smallest screen). On largers screens(iPhone 6, 6+), I'm centering the components and just give it more margin from the sides.

Note: In all of the images, the "red" area is at the same size(width and height), only the screen size changes

Should I or should I not increase the size proportionally? Is there are a known guidelines? Should I keep the font size and only increase the images?

Example: