claim: The IPhone 4 was marketed by Apple Inc..
evidence: The iPhone 4 is a smartphone that was designed and marketed by Apple Inc. .. smartphone. smartphone. iPhone. iPhone. 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 .. Worldwide Developers Conference. Apple Worldwide Developers Conference. San Francisco. San Francisco. iPhone. iPhone. It is the 4th generation of iPhone , succeeding the 3GS and preceding the 4S .. 4th generation of iPhone. List of iOS devices. 3GS. iPhone 3GS. iPhone 4S. iPhone. iPhone. 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 .. smartphone. smartphone. CEO. CEO. Steve Jobs. Steve Jobs. aluminosilicate. aluminosilicate. iPhone. iPhone. 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 .. resolution. image resolution. Retina Display. Retina Display. liquid crystal display. liquid crystal display. pixel density. pixel density. iPhone. iPhone. 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 .. Apple A4. system-on-chip. system-on-chip. iOS 4. iOS 4. FaceTime. FaceTime. video chat. Videotelephony. iPhone. iPhone. 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 .. CDMA. CDMA. front-facing camera. front-facing camera. AT&T. AT&T Mobility. iPhone. iPhone. It was succeeded as Apple 's flagship smartphone in 2011 by the iPhone 4S .. iPhone 4S. iPhone 4S. smartphone. smartphone. iPhone 4S. iPhone. iPhone. However , iPhone 4 continued to be produced until 2013 .. iPhone. iPhone. The iPhone 4 received generally positive reception , with critics praising its revamped design and more powerful hardware in comparison to previous models .. comparison. list of iOS devices. iPhone. iPhone. 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 .. iPhone. iPhone. 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. iPhone. developing countries. developing countries