Several functions on the phone require an internet connection, e.g. when you use the internet browser, send email and install apps.
Solution: Set up your phone for internet
Slide two fingers downwards starting from the top of the screen.
Press Network and Internet.
Press the name of your SIM.
Press Access point names.
Press Name and key in Telstra Internet.
Press APN and key in telstra.wap.
Press the drop down list next to "APN type".
Press the drop down list next to "Authentication type".
Press the field next to the data connection to activate it.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.
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