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If you use streaming apps/services such as spotify, pandora, clean the app cache every one or two weeks, don't download the facebook app, instead use chrome, FB it's quite heavy and will slow down your phone.
You'll struggle with that one Facebook is a system app
The first XA I purchased was awful. Software kept doing all kinds of buggy things and flickering. I decided to exchange it when best buy discounted it down to $200 for me so I stayed with it. This one has been good so far. Part of me wants to get the Z5 Compact instead but now I am having doubts on Sony's software and interface as a whole. I received a skin like case for it today which makes much less slippery. I also have a tempered glass that covers the entire front which will be good. Had I not just purchased the Moto Droid Z Force and Moto 360 2nd Gen Smart watch, I would have just ordered the Z5 Compact instead