I noticed today that my Samsung Galaxy S4 with CM13 (unofficial Kyasu's ROM) called two my contacts itself; those contacts were those which I keep in my blacklist; which was also why I had react to the incident. I have a passlock in my phone so calling itself is not possible without a break into my system. This implies me that my ROM was cracked, and used for own targets. This is the second time, I notice that my phone calls itself; first time, it called my favorite contact one week ago; in the other end, my friend heard only machine/random noise. Therefore, I would like to add additional measures to control the security/privacy of my phone.

How can you prevent your phone calling itself?

  • Android devices don't make calls by themselves... if you had the phone in pocket and accidentally "butt dialed" someone, set a lockscreen password or pattern to prevent it from happening. – acejavelin May 4 '16 at 11:52
  • @acejavelin No. I have a passlock in my phone. It is not possible. It implies me that my phone was hacked by using the security wholes existing in kuysu's unofficial ROM. – Léo Léopold Hertz 준영 May 4 '16 at 11:53
  • 1
    Don't use unofficial builds of unstable ROMs? – eldarerathis May 4 '16 at 13:59
  • @eldarerathis Yes, I understand it now. I would still have some extra protective features even in official unstable builds. – Léo Léopold Hertz 준영 May 4 '16 at 14:00

I found out more stable ROM. It was not the official one which has noise artifacts, for instance. I found some patches made by Temasek/arter97 here at points (8) and (9). Using them solves the artifact noise problem, which occurs in the official CM13 and kyasu's ROM. I also switched to Temasek ROM which seems to be one of the most used unofficial ROMs. It is the most stable ROM that I have found for the device. It also supports updates directly in the software.

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