You can add new functions to your phone by installing apps from App Store. To install apps, you need to set up your phone for internet and activate your Apple ID on your phone.
Press App Store.
Press the search field and key in the name or subject of the required app.
Press the required app.
Press Get and follow the instructions on the screen to install the app.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.