How and when Apple iphones are introduced in this world?

On January 9, 2007, Apple CEO Steve Jobs revealed the first iPhone following months of speculations and conjecture. The price of the smartphone with a two-year contract ranged from $499 for a 4 GB model to $599 for an 8 GB model when it finally went on sale in June. It had a 3.5-inch screen, a 2-megapixel camera, and received praise for its brand-new multitouch capabilities at the time. However, some claimed the phone was overpriced and would not sell well.  Apple released the iPhone 3G on June 9, 2008, one year after the first iPhone went on sale. The new model included a built-in GPS, was cheaper, gave more capacity, and could connect to 3G networks more quickly. The iPhone 3G, which went on sale on July 11 for $199 for the 8 GB model and $299 for the 16 GB model, introduced a feature known as location services. "Location services are going to be a really big deal on the iPhone," CEO Steve Jobs said. It is going to blow up. Apple's Steve Jobs unveiled the iPhone 3GS, a speedier version of the current iPhone, during WWDC. The new iPhone was twice as fast as its predecessor and ran iPhone 3.0 (an early version of iOS 8, which will be released later this month), even though the form factor remained the same. A 16 GB variant of the iPhone 3G S cost $199 while the 32 GB model cost $299. In $99, there was also an 8 GB iPhone 3G available. On June 19, 2009, the iPhone 3GS became available. Along with the newly renamed iOS 4, the updated iPhone 4 debuted on June 7, 2010, ushering in FaceTime video communication. Prices stayed the same at $299 for the 32 GB device and $199 for the 16 GB variant. On June 24, it went on sale, bringing with it the first high-resolution "Retina" screen. Once you use a Retina Display, there is no turning back, according to Steve Jobs. On October 4, 2011, a few weeks after Steve Jobs announced his resignation due to health difficulties, Apple presented the iPhone 4S in a change of pace. Tim Cook, the new CEO, praised the dual-core CPU in the iPhone 4S (which is also included in the iPad 2) and announced that sales will begin on October 14. Apple introduced as a 64 GB option in addition to the standard 16 GB and 32 GB ones, which cost $399. On September 12, 2012, the first iPhone with a 4-inch screen went on sale as CEO Tim Cook bragged about the iPhone 4S quicker, smaller update during a 90-minute presentation in San Francisco. He referred to the first-generation smartphone Steve Jobs had introduced in 2007 by saying, "This is the biggest thing to happen to the iPhone for the [original] iPhone." On September 21, the iPhone 5 went on sale; the costs for the 16 GB, 32 GB, and 64 GB variants remained the same. Tim Cook, CEO of Apple, unveiled two iPhones on September 10, 2013: the colorful, less priced iPhone 5C and the posh iPhone 5S, which now comes in gold in addition to the normal white and black. (The iPhone 5C had been just an iPhone 5 with a new skin.) The iPhone 5S received a new motion data processor that is said to be the basis for a new generation of health and fitness apps, as well as a speedier, 64-bit A7 SoC (system on a chip). The iPhone 5S started at $199 for the same amount of storage, whereas the iPhone 5C started at $99 for the same model. On September 20, both products went on sale. Apple announced two iPhones in 2014 for the second year in a row: the iPhone 6, with a 4.7-inch screen, and the iPhone 6 Plus, with a 5.5-inch screen. Both iPhones included in the new A8 CPU, which was quicker and more effective than the versions from the previous year. Both also included updated cameras and were NFC-ready for use with the October-launched Apple Pay network. Although the iPhone 6 was the same price as the iPhone 5S of 2013, the Plus variable cost an additional $100. The iPhone 6S and 6S Plus from Apple were substantial enhancements over the 2014 devices they were built on. The 6S and 6S plus included new 3D Touch force touch technology, in addition to an improved 12-megapixel iSight camera that could record 4K videos. (A new FaceTime camera with 5 megapixels that was made for better selfies) Both phones had a speedier A9 CPU and a new rose gold color for 2015.