(CNN) - On June 28, 2007, Nokia was the top selling mobile-phone company in the world, people stopped working when they left their computers, Android phones didn't exist, and high-powered executives were addicted to thumbing on their BlackBerrys.
The next day, Apple's first iPhone went on sale.
At $600, it was a luxury item at first. But five years later, the phone's dramatic impact can be seen in our daily lives, schools, factories and boardrooms. To date, more than 217 million iPhones have been sold, and they're being used by construction workers to read blueprints, doctors to diagnose patients, governments to improve services and parents to quiet their kids in restaurants.
To ring in its fifth birthday, here are five ways the iPhone has made a mark on the world.
A new way of interacting with computers
In 2007, we were a nation skilled at texting, banging out OMG-filled coded messages at lightning speeds on numerical keypads and physical keyboards. The iPhone was lacking either of those, instead offering a nothing-but-screen keyboard.
It was a classic Apple move toward dead-simple usability, and it helped bring a slice of computing to a whole new audience, including technophobes, kids, senior citizens and people with visual or hearing impairments.
Suddenly, users could navigate their phones with a few swipes of the finger. Kids intuitively seemed to know how to use it. And the phone ushered in a new wave of touchscreen devices.
After the hefty price tag, the lack of a physical keyboard was the first complaint many reviewers lodged against the iPhone. It didn't scare off consumers, though, and Apple sold a million iPhones in less than three months. Typing speeds on the iPhone still may not rival a pair of BlackBerry thumbs at their peak, but predictive-text software, spell check and, later, cut and paste have made it a usable alternative.
In October, Apple tried to shake up input again with the introduction of the Siri voice-assistant feature. The voice-recognition technology encouraged users to speak commands and questions instead of tapping them in on the screen.
Rise of the app
The iPhone's killer feature was not that tough, expansive glass touchscreen. It was the mobile operating system, iOS, and the tightly controlled App Store released a year later in 2008 that made the iPhone into, well, whatever you wanted it to be.
The original device was useful enough: It shipped with a built-in Apple apps for checking the Internet, weather, e-mail, texts, stocks, calendars and the time. But when the App Store opened, people suddenly had access to a stockpile of well-designed third-party apps, and developers were able to build an astonishing variety of custom apps.
With the right app, an iPhone could track the sun, sync shopping lists, be a drum machine, take restaurant reservations, be a cash register. Meanwhile, Apple's TV ads made "there's an app for that" into a catchphrase and a headline cliche.
In classic Steve Jobs style, Apple took complete control of the sales and app-approval ecosystem. Apps have to be approved by Apple before they can be sold, meaning fewer spam apps and viruses make it through to consumers. It also means the company can reject apps as it pleases -- say, when a feature competes with an Apple product -- to the occasional displeasure of the developer community.
The App Store has also created a new mini-economy. Apple has paid out more than $5 billion to developers, and that's after taking a 30% cut off all app sales for itself. Today, there are more than 650,000 mobile apps available in the App Store, ranging from free to $1,000 for specialized business applications.
The iPhone ushered in an age of all Internet, all the time. For better or worse, it's blurred the lines between work and home lives, made communication a round-the-clock habit and led to a host of new rules about when and how it's appropriate to use smartphones (not while walking, driving, playing trivia or on a date, please).
The phone, whose price soon dropped to $200 or less with a two-year wireless contract, gave users instant access to a multitude of ways to communicate: texts, e-mail, Twitter, Instagram, Grindr, Foursquare, Facebook, FaceTime. There's even a so-so phone on there. Mobile phones had limited Internet access before the iPhone, but the device's browser was a huge improvement, displaying web pages more like they actually looked on a desktop computer.
All this connectivity brought a new disorder: smartphone addiction. A recent study by gadget-resale site Gazelle found that 15% of respondents would rather give up sex than go without their iPhones for a weekend. That type of titillating stat is not surprising to anyone for whom the iPhone is the last thing they see at night and first thing they check in the morning.
As Apple grew from underdog into the largest company in the world by market cap (it made $108 billion in 2011), its manufacturing chain was pushed to greater