Too many scam calls

Got tired of these scam callers..some have a 229 prefix..so l went looking for a way to block them..found a pretty cool app called DU caller ID call blocker. .uploaded it and now l have helped to identify several scam calls and blocked them....when they call l don't even hear the phone ringing...they are so annoying..there is everything from health insurance- auto recall crap-plus income tax scams...beware people