El-Refaey, the first it's not Xperia M2 section here, it's Xperia M or Xperia Dual... Second i'm using Kaspersky Mobile Security, it's really great app. All information u can find here http://www.kaspersky.com/android-security and here https://play.google.com/store/apps/details?id=com.kms.free&hl=en I don't write you about all features of this app, you can find all information in sites which i posted. About free apps... free app is free app... I think better is to sell a little bit money and to have safe device neither use free app and have minimal defence which is not guarantee that full defense... You don't have good defence for free... Offcourse you can use others antivirus, before i choose Kaspersky, i used Nod antivirus, but Kaspersky for me looks much better, it's not just number one antivirus in the world on PC, i think it's one of the best number one antivirus for smartphones too... I'm using Kaspersky on PC too and i didn't had any problems with virus yet (with Nod i had on PC a little bit)... Just use legal versions, don't trust cracked versions... Cracked app is the same like free... it's cracked... You don't have all full supporting from developers and ect 
I think people don't must to spare, to reserve and ect., money for some things like your privacy, guard, defence and ect. Kaspersky i like coz it's not just good app, but this app really working good on Xperia M, it not lagging, battery draining fast with or without this app (i think Sony did programming mistakes, bugs, coz it's not for me one this problem is), so i think this app don't have big effect for that, somewhere i read that this app is not using a lot of battery's energy. I don't know about others antivirus so much like i know now about Kaspersky, but i'm really glad that i choose this antivirus... and i don't want to change it into other For me it's the best antivirus on PC and on smartphones too By the way, Kaspersky, how u can see, giving some features for free too, but i paying for full license, coz like i said for some things people don't must to spare money You can lose sometime much more that some dollars, euros and ect
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