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Definition: iPhone versions

Following is a summary of iPhone models since the first iPhone in 2007. There are always enhancements but the primary ones are outlined below. See iPhone and iOS versions.

iPhone XS, XS Max and XR - September 2018
Faster processors geared for AI, virtual reality, etc. Two top models are the 5.8" iPhone XS and 6.5" XS Max. The 6.1" XR replaced the 5.8" X but reverted to an LCD screen rather than OLED. See iPhone X series.

iPhone X, 8/8 Plus - September 2017
Thinner bezel on the X, an OLED screen and wireless charging. More biometric recognition (iris, face, etc.). The top model cost more than USD $1000 with 256GB storage. See iPhone X and iPhone 8.

iPhone 7/7 Plus - September 2016
Same size as the 6/6 Plus but water resistant and no analog headphone jack. The 7 Plus camera switches between wide angle and regular lenses. See iPhone 7.

iPhone 6/6 Plus - September 2014
Thinner with many enhancements and larger screens: iPhone 6 is 4.7"; 6 Plus is 5.5". Apple's first credit card payment system was included (see Apple Pay). See iPhone 6.

iPhone 5S/5C - September 2013
Additional motion-sensing processor, fingerprint reader and greatly enhanced camera. For the entry-level market, the iPhone 5C was introduced (repurposed 5 with larger battery and colorful cases). See iPhone 5S, iPhone 5C and iOS versions.

iPhone 5 - September 2012
The taller, thinner iPhone 5 included a larger screen, improved camera, re-designed earbuds and dock connector and support for the higher-speed 4G LTE networks. See iPhone 5 and iOS versions.

iPhone 4S - October 2011
The 4S added numerous features, including the Siri voice-based intelligent assistant. Although it looks like the 4, there were internal hardware changes. See iPhone 4S, iOS versions and Siri.

iPhone 4 - June 2010
The thinner iPhone 4 offered higher resolution, FaceTime video calling and multitasking. In February 2011, Verizon offered its first iPhone, a CDMA-based iPhone 4. See iPhone 4 and iOS versions.

iPhone 3G S - June 2009
The 3G S added a faster processor, video camera, voice phone dialer and improved battery life. With iOS 4, the 3G S finally had multitasking. See iOS versions.

iPhone 3G - June 2008
The higher-speed 3G data service was very welcome. The 3G added many improvements, including GPS. However, most significantly, the 3G was introduced with an application platform that made the iPhone a general-purpose computer and turned the mobile world upside down. The 3G also debuted in Canada and other parts of the world (see SIM lock). See iOS versions.

First iPhone - June 2007
Introduced in the U.S. exclusively from AT&T, the first GSM-based iPhone was greeted with extraordinary enthusiasm (see "Quite a Frenzy" in iPhone). Although users raved, the first model used the GPRS and EDGE data networks, which were painfully slow for surfing the Web. See iOS versions.