Back to GS, How to Start a iPhone only Game, targeted for all iPhones

fedi

Hi, i have not used GS for a while, i have searched the forum and also check some videos. But did not found a answer on what is the best way to make the game work for all iphones.
can someone explain me whats the simplest way ?
thanks

epicstag

via @socks

fedi

i have tried this, but its not working.
What about when you start a new project. You select iphone portrait and the screen and graphics are adapted to iphone 5. But not for iphone 4 how you can adapt them for iphone 4 ?