using the ios simulator

hi ive almost finished my first game and i was wandering when i get it o ut of GS do i have to run it through the ios simulator to make sure it works with all iphones, at the moment ive just been testing it on my 3gs...
Comments
to make sure it works on ALL devices, you want your ram usage to stay under 40GB, to have it work on 3Gs and up, i think you want to keep it under 80.
Calvin