title: iPHONE: This is not a test user accout please create a new account in the sandbox environment ERROR
body: <p>I have created an iphone application with in-app purchase.</p>
  
  <p>5 out of 10 users are reporting the following message when they try to buy something using in-app purchase:</p>
  
  <blockquote>
    <p>This is not a test user accout please
    create a new account in  the sandbox
    environment.</p>
  </blockquote>
  
  <p>I have tested the in-app purchase and I never got such error.</p>
  
  <p>any clues?</p>
  
  <p>any help is appreciated. thanks. </p>