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When trying to connect the navigation. there is a message, Network failure, this application requires a working data connection.
I have looked up the settings on the sonymobile website, but still have a problem.
IS your wifi and mobile data on?
You need an Internet connection on your phone to be able to use the navigation app.
You can download Internet settings from settings > Xperia > Internet settings. Also make sure that you have data enabled. Settings > more... > mobile networks > data enabled.
Restart your phone.