Bună!
Poţi instala o aplicaţie gen "call blocker" de la linkul :
https://play.google.com/store/apps/details?id=com.mrnumber.blocker
https://play.google.com/store/apps/details?id=com.vladlee.easyblacklist
https://play.google.com/store/apps/details?id=embware.phoneblocker
https://play.google.com/store/apps/details?id=com.visinor.phonewarrior
https://play.google.com/......ps/details
Toate cele bune.