Talk about a game-changer -- a world-changer, even.

The iPhone, Apple Computers' signature smartphone device, turns 5 on Friday.

In 2007, the first iteration was unleashed on throngs of early adopters, who admired its touchscreen interface and poked at little icons, as noted by mashable.com. Now, the smartphone has become standard issue, thanks in large part to the iPhone’s overwhelming success and iconic design.

iPhone sales were a tiny slice of Apple's overall pie in 2007. In 2012, it accounts for 58 percent of the company’s revenue. Apple's iPhone business accounts for $22.7 billion, which is more than the entire revenue of companies such as Coca-Cola.

Not only is the iPhone useful for, uh, phone calls, but it allows one-touch photo and video uploading to the Internet. And its many apps enable such things as weather forecasts and even online ordering at retail outlets. Yes, even Patch.com has an iPhone app.

And among the fallout: Research In Motion, maker of the BlackBerry smartphone. Before the iPhone, BlackBerry was the standard in smartphones. Now, RIM is said to be in a "death spiral."

So, do you have an iPhone? How has it changed your daily routine? Tell us in the comments below.