Device Guides
Apple iPhone 5s
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iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

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How to
Installing Twitter on my mobile phone
Want to install Twitter on your mobile phone? It's easy, but remember you need to set up your mobile phone for internet and activate your Apple ID before you can download and install Twitter.
Tap Settings.
Tap Twitter.
Tap INSTALL.
If you're asked to log on to App Store, do this.
Wait a moment while the application is installed.
Tap the Home key to return to the home screen.
When the installation is complete, you can use Twitter.