title: Designing for iPhone OS 2.0 and 3? Is that possible?
body: <p>I have an application built for iPhone 2.0 but I would like to use StoreKIT to offer in-app purchase. </p>
  
  <p>If I recompile the code under 3.0, I can use StoreKIT but I will piss those who bought my app and do not upgraded to 3.0. </p>
  
  <p>Is that a way to create a code that can work on both worlds? If yes, what steps should I follow?</p>
  
  <p>thanks for any help.</p>