iPhone iOS 4: Should I Upgrade to iOS 4 Software? The new operating system, which debuted in April when Apple first announced what was called iPhone OS4, includes the ability to multitask, along with a unified e-mail box and app folders - among the most wanted features mentioned by users.

As he walked the crowd through a demo, the always stage-savvy Jobs couldn't resist the opportunity to get in a dig at Larry Page, quoting Google's co-founder as saying that software running in the background runs down a battery.

iOS 4 still follows the old method of pop-up notifications that will keep disturbing you. So, every reply to your chat conversation or a new SMS will make the iPhone bring a pop-up menu in focus, requiring you to take an action before you can get back to what you were doing.

This is not good, especially now that they've got multi-tasking working, they could have done better with handling notifications. Not to mention the fact that the pop-up reveals content right in your face, for any prying eye to easily get a glimpse of.