I have downloaded an app called RoboKiller and it has worked well so far. I used to get spam calls from Russia, India and Indonesia at 3 am in the morning and w

I have downloaded an app called RoboKiller and it has worked well so far. I used to get spam calls from Russia, India and Indonesia at 3 am in the morning and wake me up. After downloading the said app these calls have drastically even though once in a while a spam call gets through.