A lot of people are annoyed by the MyXperia notificaitons. Here is a quick tip on how to get rid of it. Go to Settings=>Apps=>All find my Xperia and uncheck ‘Show notifications’. If this doesn’t work, then another option to get rid of it is to freeze it with the Titanium Backup, since it is a security app that is hard to disable. Titanium back xperia z annoying notification myperia