IOS upgrade refusal
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Apple, Inc. has released a new version of its iOS software used on iPhones, iPads, and iPods. Each new version of iOS includes new features and various other changes over the previous version. While the refusal to upgrade enables owners of their devices to keep the features of the previous version of the software that would be lost, users are denied access to new features and are also unable to download some apps that are designed only for later versions of iOS.
iOS 6 was released in September 2012, with Apple Maps as its headline feature, replacing Google Maps as the default mapping application. Some users refused to update as a result, due to the immaturity of Apple's maps compared to Google. There were additional complaints about a faster draining battery and lack of brightness.
In December 2012, Google released a standalone version of Google Maps, thereby enabling iOS 6 users to use Google Maps again. According to MoPub, 5 days after the app's release, there was a 29% increase in unique iOS 6 devices impressions.
iOS 7 was released in September 2013, featuring a flatter UI design across the entire system. Some users complained of nausea from the parallax effect and transition effects. iOS 7 was reported to perform slower than its predecessor on older devices, such as the iPhone 4. Some apps were found to be incompatible with iOS 7 until they were updated. More than 200 million customers upgraded to iOS 7 within a day of its release.
iOS 7.1 addresses several criticisms of 7.0, such as an option to toggle wallpaper parallax on or off, and improved performance on iPhone 4. By April 2014, 87% of users had updated to iOS 7, and 58% to 7.1. 
iOS 8 was released on September 2014, along with the iPhone 6 and iPhone 6 Plus. Users complained that the new feature, custom keyboards, were glitchy and unusable. The updated UI was also very glitchy, and many users had problems with multitasking gestures.
- Hornshaw, Phil (October 14, 2011). "Just so you know, iOS 5 can keep track of your location like never before". Appolicious.