Query: The IPhone 4 is a smartphone owned by Microsoft.

Relevant passages:
List of iOS devices <=SEP=> This is a list and comparison of devices designed and marketed by Apple Inc. that run a Unix-like operating system named iOS , often colloquially referred to simply as iDevices . The devices include the iPhone multimedia smartphone , the iPod Touch handheld PC which , in design , is similar to the iPhone , but has no cellular radio and other cell phone hardware , and the iPad tablet computer . All three devices function as digital audio and portable media players and Internet clients . The Apple TV , which ran iOS from the second generation of hardware onward , is a set-top box for streaming media from local sources and from certain internet services to a connected television set , and has no screen of its own . About 1.35 billion iOS devices have been sold worldwide as of March 2015 .   The operating system on iOS devices can be updated through iTunes , or , on iOS 5 or later , using over-the-air ( OTA ) updates . A major version of iOS tends to be released every time a new type of iPhone is launched , ( usually once a year ) with minor changes throughout the year as needed . All updates are free to iOS devices ( although iPod Touch users were formerly required to pay for the update ) . Apple upgrades its products ' hardware periodically ( approximately yearly ) .

IPhone <=SEP=> 7 / 7 Plus :  -RCB- -RCB-  | unitssold = 1 billion +   | service =  -RCB- -RCB-  iPhone ( -LSB- ˈaɪfoʊn -RSB- ) is a line of smartphones designed and marketed by Apple Inc. . They run Apple 's iOS mobile operating system . The first generation iPhone was released on June 29 , 2007 , and there have been multiple new hardware iterations since .   The user interface is built around the device 's multi-touch screen , including a virtual keyboard . The iPhone has Wi-Fi and can connect to cellular networks . An iPhone can shoot video ( though this was not a standard feature until the iPhone 3GS ) , take photos , play music , send and receive email , browse the web , send and receive text messages , follow GPS navigation , record notes , perform mathematical calculations , and receive visual voicemail . Other functionality , such as video games , reference works , and social networking , can be enabled by downloading mobile apps . , Apple 's App Store contained more than 2.2 million applications available for the iPhone .   Apple has released ten generations of iPhone models , each accompanied by one of the ten major releases of the iOS operating system . The original 1st-generation iPhone was a GSM phone and established design precedents , such as a button placement that has persisted throughout all releases and a screen size maintained for the next four iterations . The iPhone 3G added 3G network support , and was followed by the 3GS with improved hardware , the 4 with a metal chassis , higher display resolution and front-facing camera , and the 4S with improved hardware and the voice assistant Siri . The iPhone 5 featured a taller , 4-inch display and Apple 's newly introduced Lightning connector . In 2013 , Apple released the 5S with improved hardware and a fingerprint reader , and the lower-cost 5C , a version of the 5 with colored plastic casings instead of metal . They were followed by the larger iPhone 6 , with models featuring 4.7 and 5.5-inch displays . The iPhone 6S was introduced the following year , which featured hardware upgrades and support for pressure-sensitive touch inputs , as well as the SE -- which featured hardware from the 6S but the smaller form factor of the 5S . In 2016 , Apple unveiled the iPhone 7 and 7 Plus , which add water resistance , improved system and graphics performance , a new rear dual-camera setup on the Plus model , and new color options , while removing the 3.5 mm headphone jack found on previous models .   The original iPhone was described as `` revolutionary '' and a `` game-changer '' for the mobile phone industry . Newer iterations have also garnered praise , and the iPhone 's success has been credited with helping to make Apple one of the world 's most valuable publicly-traded companies .

IPhone 4 <=SEP=> The iPhone 4 is a smartphone that was designed and marketed by Apple Inc. . Following a number of notable leaks , the iPhone 4 was first unveiled on June 7 , 2010 , at Apple 's Worldwide Developers Conference in San Francisco , and was released on June 24 , 2010 , in the United States , United Kingdom , France , Germany and Japan . It is the 4th generation of iPhone , succeeding the 3GS and preceding the 4S .   The iPhone 4 introduced a new hardware design to the iPhone family , which Apple 's CEO Steve Jobs touted as the thinnest smartphone in the world at the time ; it consisted of an uninsulated stainless steel frame which doubles as an antenna , with internal components situated between chemically strengthened aluminosilicate glass . The iPhone 4 also introduced Apple 's new high-resolution `` Retina Display '' ; while maintaining the same physical size and aspect ratio as its precursors , its liquid crystal display had a pixel density of 326 pixels per inch . The iPhone 4 also introduced Apple 's A4 system-on-chip , along with iOS 4 -- which notably introduced multitasking functionality and Apple 's new FaceTime video chat service . The iPhone 4 was also the first iPhone to include a front-facing camera , and the first to be released in a version for CDMA networks , ending AT&T 's period as the exclusive carrier of iPhone products in the United States .   It was succeeded as Apple 's flagship smartphone in 2011 by the iPhone 4S . However , iPhone 4 continued to be produced until 2013 .   The iPhone 4 received generally positive reception , with critics praising its revamped design and more powerful hardware in comparison to previous models . While it was a market success , with over 600,000 pre-orders within 24 hours , the release of the iPhone 4 was plagued by highly publicized reports that abnormalities in its new antenna design caused the device to lose its cellular signal if held in a certain way . Most human contact with the phone 's outer edge would cause a significant decrease in signal strength .   The iPhone 4 spent the longest time as Apple 's flagship iPhone model at fifteen months , and had the longest lifespan of any iPhone ever produced , spanning close to four years and available in some developing countries until early 2015 .

IPhone 4S <=SEP=> The iPhone 4S ( retroactively stylized with a lowercase 's ' as iPhone 4s as of September 2013 ) is a smartphone that was designed and marketed by Apple Inc. . It is the fifth generation of the iPhone , succeeding the iPhone 4 and preceding the iPhone 5 . Announced on October 4 , 2011 at Apple 's Cupertino campus , its media coverage was accompanied by news of the death of former Apple CEO and co-founder Steve Jobs on the following day .   Orders could be placed on October 7 , 2011 and mainstream availability in retail stores began on October 14 , 2011 in the United States , Australia , Canada , the United Kingdom , France , Germany , and Japan , sales peaked over its predecessor with more than a million sales in the first twenty-four hours of order availability and more than four million sales in the first four days of retail availability . Further worldwide rollout , including 22 additional countries on October 28 , came over the next several months .   This iPhone was named `` 4S '' where `` S '' stood for Siri ( Apple CEO Tim Cook confirmed that during the Q&A session at the D10 conference in May 2012 , ) an iPhone 4S-exclusive intelligent personal assistant that was later included in future generations of mobile Apple products . Retaining the most of the external design of the iPhone 4 , the 4S hosted major internal upgrades , including an upgrade to the Apple A5 chipset , and an 8-megapixel camera with 1080p video recording . It debuted with iOS 5 , the fifth major version of iOS , Apple 's mobile operating system , that introduced features including iCloud , iMessage , Notification Center , Reminders , and Twitter integration .   Reception to the was generally favorable . Reviewers noted Siri , the new camera , and processing speeds as significant advantages over the prior model . It was succeeded by the iPhone 5 as Apple 's flagship phone on September 12 , 2012 . The iPhone 4S remained in production , albeit being sold with reduced storage ( from 16/32/64 GB down to 8 GB ) . It was discontinued officially on September 9 , 2014 , following the announcement of the iPhone 6 , but is currently supported as of iOS 9 . During the course of its lifetime , the iPhone 4S is the best-selling iPhone ever produced and it is the first iPhone to support five major versions of iOS : iOS 5 , iOS 6 , iOS 7 , iOS 8 , and iOS 9 . The iPad 2 was supported from iOS 4 to iOS 9 . It is also the last iPhone to have the original 30 pin connector as it was replaced by the Lightning Connector when the iPhone 5 was released .