It depends on which one you are purchasing.
For me in customized phones:
1: Eliminate banner ads
2: Backup everything
3: Increase battry life
4: Intallation of Custom ROM
5: Run any app accordin to the need
6: Perform other UL tweaks
There is site called SOFTONIC where you can search "MKV PLAYER" which is used for Win 8 mobiles phones. This app is very easy to use and downloaded for free of cost which follow with some few configuration option.
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