Robert Balousek has found some interesting spots appearing on this Apple product. As he got beyond the shine there is a very important detail that he discovered; namely that only one iPhone application can run at a time. And what is worse is that third-party applications will NOT run in the background.
So what does that mean? If you’re running an application and the phone rings … you lose!! The app you were running closes!
Robert found some very interesting facts in the iPhone Human Interface Guidelines PDF
Robert explained it like this:
If you are running an application such as AOL Instant Messenger on your iPhone, everytime you receive a call or browse away from the application you would be signed out, you would lose any unread messages, and your conversations would end.
Check out the piece by Robert Balousek here.