Why does my phone call random international numbers seconds apart?

[AC Question]

why does my phone call random international numbers seconds apart?

My phone an HTC Desire 816 keeps calling random international numbers. I lost all my dollars because of this problem. It calls the numbers behind each other.

 

[belodion]

The phone may have been hacked or something else unpleasant....try clearing the cached data in Settings, Storage, and if no good, try Safe Mode. If that doesn't fix it, consider Factory Resetting it.

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