My understanding is that political groups and charities can call anyone, even numbers on the Do Not Call list.
Most of the spam calls are made using VOIP (Internet) lines, often originating overseas, and difficult to trace. The number that shows up on your caller ID is not the number they are calling from. The spammers can make any number display, which is why you will frequently see an incoming call that appears to be coming from the same prefix as yours. They want you to think a "neighbor" is calling you so you will answer it. You can add it to your list of blocked numbers but it won't help much because next time they will display a different number.
There must be a lot of people buying what they are selling or they would stop calling.
I use an app called Hiya on my iPhone which works well. I think there is an annual fee of ten bucks or something.
kathy
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