maybe your device was infected with malware or adware, i can't understand how some apps like that are still available on Google Play store. Google...
Best way to keep you PC away from virus or trojan is never visiting untrusted sites, download crack/hacked/modded files. Once your Pc is infected...
i hate texting sms and making phone calls. just hang out on chat app (Allo, Facebook,...) and make a video call. I don't knw why but i hate...