▲ iPod Classic

At the start of the development of iPhone, it was only 2G. It was released in 2007. There was iPod already, so Steve Jobs believed that if he call call using it, it can be revolutionary. So, he did it. He made iPod which can call, do internet and check the e-mail. However, it cannot take a video, and its storage is only 16GB. However next year, iPhone 3G was released. The iPhone 2G used second-generation mobile communication technology, but they upgraded it to third-generation mobile communication technology. Moreover, exactly one year later, they released iPhone 3Gs, which can take videos, voice control, and digital compass. Also, it can send MMS and e-mail that older generation just can check the e-mail. iPhone 4 was released in 2010, and it used Apple CPU, not used other company's CPU. It was their first Retina Display phone, and it has four times sharper definition. To add, they upgraded the storage, so they can use 32GB. Also, they released the 's' model, and it has 64GB for storage and seven times more vivid than the iPhone 4. Moreover, this phone became monumental phone because it can use i Cloud service and AI voice personal assistant, 'Siri'. They released iPhone 5 next year of iPhone 4s, and people can use iPhone in LTE. The phone became larger to four inches (before, it was only 3.5 inches). It became the first iPhone that has 16:9 picture ratio, and after one year later, they released 'S' model and 'C' model. There is a new password called 'Touch ID' which is the password with fingerprint, and it is the first 64-bit phone in the world and can be faster than other generation. Also, in 2014, iPhone 6 was released, and people around the world want a phone with big screen, so they released iPhone 6+ which has 5.5 inches screen. Moreover, today, there is iPhone 8 and iPhone X. They have 256GB storage and facial recognition camera that can set a password with the owner's face. And it has notch, which can use more screen than other iPhone.

▲ iPhone X

The future of iPhone is very vivid. Apple made iPhone 2G to iPhone X only in ten years, and it became very complex and elaborate. I hope someday I can use the iPhone more elaborate than these days.