iOSThe iOS is developed by Apple and powers iPods, iPhones & iPads.
The Apple support website has an article on how to change the language setting.
There are a whole number of apps in the iTunes App Store that help you learn Chinese, practice pinyin, ...
- Google Translate by Google. This app allows you to translate words or text messages to and from Chinese. It also allows voice input and can read out the translation. It can also convert Chinese characters to Pinyin.
[ < Smartphones]