I had the same call-hack on my phone few month a go, that in about five minuts time, four calls has ben made from my phone and riping of 0.50c€ or 1€ and i have the nambers on my call-loog...but this numbers are not part of my contact list and don't know of what country they are from...when ones i saw it's call active and unknown number to me, i rejected call activity instantly on red buton and i saw the maps app was launched...than i sweep down it...i only know that on that particular day i installed "waazap" app...then after it happen that calls, i uninstalled waazup...and forgot it...newer used again...i could post numbers in here if it's alowed..but anyway it was hack for sure!:-(