You need to install Twitter in order to use it on your mobile phone. Before you can install Twitter, you need to set up your mobile phone for internet and activate your user account on your mobile phone.
Open Google Play
Tap the Play Store icon.
Tap the search field.
Key in Twitter and tap the search icon.
Tap Install and follow the instructions on the screen to install the app.
Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.