how to start to export to phone?

hello

I wanted to know if there was a way better now that another starting a project if you later want to export it to phone in terms of screen size? (For my iphone for 5, 6 and 6+ and android if possible )

because ca be painful to repeat the game several times for different sized screens if one takes so bad ...

I have a second question, when you put an application on the appstore, we must make an iphone version 6 and 6 + ihpone for screen sizes? how to do?

thank you in advance

person on this forum only exports on the phone?

all you have to worry about is aspect ratio the best way to scale to all phone/tablets is using Scale Outer. Using Scale Outer will Scale the View size to fit the Aspect ratio of the device

thank