If you answer the phone and hear a recorded message instead of a live person, it's a ROBOCALL.
Robocalls trying to sell you something are almost always illegal. Many are also probably scams. There are however, some Robocalls which are purely informational — such as information about a fire nearby or from the sheriff.
BEST THING TO DO IF YOU GET A ROBOCALL??
1- Hang up. Pressing numbers to speak to someone or remove you from the list will probably only lead to more robocalls. And the number on your caller ID probably isn’t real. Caller ID is easy to fake, so even if it shows that a call is coming from nearby or a company you know, you can’t trust it.
2- Block. Check with your phone provider to see what call-blocking or call-labeling services they offer or recommend. Some services are free but some may charge you a fee. Some cell phones have built-in features to block calls.
3- Register. The National Do Not Call Registry is designed to stop unwanted sales calls — live call or robocalls. Add your number(s) to the Registry at DoNotCall.gov or call 1-888-382-1222. This is a free service. Your registration never expires. It will not stop all calls, but will cut down on some. More information is available at consumer.ftc.gov.
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BE CAUTIOUS When you shop online or set up new electronics, you may need to create an account. That used to mean entering your email address. Recently many services verify you by text. Some bad guys use a technique called neighbor spoofing, which gives the incoming number the same area code as yours in hopes that you’ll mistake the caller for your mechanic or your kid’s school. It’s distressingly lucrative. Some call centers make hundreds of thousands of dollars a day selling victims’ information online. Here's how to fight back.
BE STINGY The next time a cashier asks for your phone number, decline. When you sign up for an online service, look for a fine-print check box to say that you don’t have a phone. If it says “field required,” keep reading.