I have MrNumber and it has seriously cut down the spam and robo calls.

It is not "junk mail". It is commerce that funds the most efficient & reliable postal service on the planet. This is one of Benjamin Franklin's many contributions to our nation. Please do not disparage the funding of our mail carriers who suffer from the weather, poor management, & disrespectful postal patrons. That business & commercial enterprise should be dismissed as "junk" reveals a lack of understanding on just how capitalism functions.

I get these all the time too on my cell phone, even calls at my job. I noticed that they do use similar area codes, but they also start with a + and a number which is usually outside the United States. It's called a country code. Anything other than +1 is not a call coming from the USA.

I used to be plagued by people who wanted to help me claim for a car accident injury. Sometimes I would get a call of this nature every couple of days. Then one day when I was waiting for an urgent call from one of my family, one of these clowns rang. I snapped. I don't know what came over me, but I cursed this guy and his family in the name of god, for illegally using my phone number for this purpose . I didn't get another call for months and months. Then about a year later it started again so I did the same thing again and haven't had another call of this nature since. Nowadays I feel a bit guilty for disrespecting the sensibilities of these people. After all they are only trying to make a living. But I've never heard of any other method being successful in blocking cold calling

I use NomoRobo in my landlines and Android...I rarely get robo calls anymore...

If I don't have the number in my contact list, I don't answer the call. That said, there are times when I'm waiting for a callback and so I have to answer just in case it's the call I'm waiting for. When I do this, the nuisance calls I get the most are the instant hang-ups. I answer the phone and tit instantly hangs up. I've always assumed it's some kind of auto dialer confirming that the number is active so they can follow up later with their sales pitch.

That's just a guess. I'm not sure what it actually is but I get it a lot.

I am overrun with robo calls!!! They wake me up daily!!! I recently added nomorobo, supported by my (land line) phone company, and it has helped a ton.

Mail -- I only check it about once a week. Junk mail is annoying. I toss it in the recycle bin. I haven't specifically noticed an increase, however.

Calls -- I rarely answer unrecognized numbers. If I do answer, I request to be removed from the database. Otherwise, I'll Google the number and if it is a solicitation, I will often block the number using that feature on my phone.

I also registered for this Opt Out for Five Years. It's not foolproof, but I don't find I am inundated with offers and calls: [consumer.ftc.gov]

As for mail. I do not think anything can be done about it other than just tossing it.
If I do not recognize the caller name or number, I simply do not answer my phone or just reject the call. If it is something necessary, they will leave a message and I can return the call.
Still very annoying however.

Yes. If you've got a p.o. box, you'll get deluged with junk mail. I've had four, over the past 20 years. And the junk mail was a big headache. One solution might be to buy a paper-making kit from Hobby Lobby, and convert it all into stationary, or maybe even toilet paper. But you'd only be re-cycling it. Another solution might be to mark each piece "Return to Sender", and re-mail it.(Although, I don't know if the Post Office accepts re-mailed junk mail).