IPod touch (4th generation)

The 4th-generation iPod touch is a portable media player and personal digital assistant that was announced by Apple at a special event on September 1, 2010 and released on September 12. This iPod touch was set at the price range of $199 to $399. It originally came in just a black model, but a white version was later introduced in a "Let’s Talk iPhone." event on October 4, 2011, at the same time as the iPhone 4S. . It was succeeded by the 5th-generation iPod touch on September 12, 2012.

New features
The new iPod touch included many new features from the iPhone 4, including a Retina display, a FaceTime camera, and a 720p HD iSight camera. The 4th-generation iPod touch is 26% thinner than the 3rd-generation model. The iPod touch 4 first came in black with iOS 4.1.

Updates
On October 4, 2011, Apple announced a new white iPod touch, which was still from the 4th generation iPod touch family as it had the same specs as the original black one. Its new features were enabled by the iOS 5 update that was released on October 12, 2011. It could support up to iOS 6.1.6, it did not support iOS 7 due to the fact that the iPhone 4 had twice as much RAM (512 MB) than the corresponding iPod touch (256 MB). Some hackers had managed to install iOS 7 on a 4th-generation iPod touch, but found functional problems with audio output, Bluetooth, cameras, Multi-touch, sensors, and general stability, making it virtually unusable. The 4th-generation iPod touch was discontinued in May 2013 and replaced with the 16 GB 5th-generation model which omitted the rear camera.

Issues

 * Some 4th-generation iPod touch users experienced Wi-Fi signal dropping when texting and browsing the web. Other users experienced sound issues when recording video with Wi-Fi on.
 * The older, original 4th-generation iPod touch (with iOS 4.x before iMessage was introduced) doesn't work with some docking stations.
 * 4th-generation iPod touch models manufactured after a certain date were shipped with iOS 6, and could not be as easily downgraded like previous models.