Chief Executive Officer of Apple, Steve Jobs attends a press conference in central London, 18 September 2007. Apple announced here Tuesday that Britain would be the first European country to get its much-vaunted iPhone, when mobile phone operator O2 launches the gadget on November 9. Apple chief Steve Jobs told a London press conference that O2, owned by Spain's Telefonica, has won an exclusive contract to distribute the iPhone in Britain for "cultural," rather than economic, reasons. He said the iPhone would retail in Britain at 269 pounds (387 euros, 536 dollars). AFP PHOTO/SHAUN CURRY (Photo credit should read SHAUN CURRY/AFP via Getty Images)
Feeling nostalgic? Take a look at the excitement over Apple's first iPhone
02:49 - Source: CNN Business
New York CNN  — 

The iPhone redefined the term “cell phone.” Apple’s trademark product revolutionized the mobile phone industry, shifting from flip phones and keyboards to large screens and powerful cameras.

With 1.2 billion units reportedly sold, the iPhone is arguably the most popular tech device in the world.

With Apple set to unveil the iPhone 15 on Tuesday — chock full of rumored new features like a USB-C charging port, new colors and better battery performance — here is a look back at every iPhone to hit stores.

Apple CEO Steve Jobs introduces the new iPhone at Macworld in San Francisco on January 9, 2007.

2007: The Original iPhone, a phone with internet

Apple releases the original iPhone, a much-anticipated device that combines an iPod, phone and what then-company chairman Steve Jobs calls an “internet communicator.”

“This is a day I’ve been looking forward to for two-and-a-half years,” Jobs told the crowd when unveiling the new $399 product, a 16 GB phone with a relatively terrible 2.0 megapixel camera and relatively large 3.5” screen.

Customers queue outside the Apple Store in London for the launch of the iPhone 3G on July 11, 2008.

2008: iPhone 3G, meet the App Store

With the second version of the iPhone, Apple introduces the App Store and 3G connectivity. The new device, half the cost of the original iPhone, sold more than 3 million within a month, far outpacing its predecessor and expectations.

An Apple Store customer plays with the new iPhone 3Gs on June 19, 2009 in San Francisco, California.

2009: iPhone 3GS, annnd action

The 3GS introduces capabilities to record videos, as well as basic voice control (though Siri is still years away). The first “S” update to the iPhone also doubles the storage system, offering users an upgraded 32GB.

An Apple employee demonstrates "Face Time" on the new iPhone 4 at the 2010 Apple World Wide Developers conference on June 7, 2010 in San Francisco, California.

2010: iPhone 4, Selfie time

A completely redesigned device hits the shelves: thinner and sleeker with a better battery, camera and screen, the iPhone 4 starts to resemble the phone many of us use today. And with the addition of a front-facing camera, selfies and FaceTime calls enter into the chat.

“I grew up with the Jetsons dreaming about video phones,” said Jobs at the announcement. “It’s real now.”

An Apple customer demonstrates the voice assistant program on his newly purchased iPhone 4s outside of an Apple Store in New York City on October 14, 2011.

2011: iPhone 4S, Hello, Siri!

Apple introduces the world to Siri, its now-iconic voice assistant, and the iMessage feature that allows iPhone users to message each other freely. Users are also given iCloud, making it possible to automatically sync all Apple devices.

A newly released Apple iPhone 5 sits on a coffee shop countertop next to Apple's lightning connection cable in September 2012.

2012: iPhone 5, the Lightning cable arrives

With the iPhone 5 comes the Lightning cable, a shift away from the larger charging port used in Apple’s original iPhones and iPods. The 5 also gets a larger screen and LTE connectivity, making the phone much faster than its predecessors.