It happens to everyone.
Start screening your calls and ONLY answer when you KNOW the person/company who is calling you.
There are those who will call and hang up .. what they are doing is to see if your phone number is a number where they can get ahold of an actual person ... and if it IS, then they sell YOUR number to whoever wants to cold-call the public for any reason.
Also, there are many 3rd-World scammers trying to trick you out of your money .. OR out of your identity. Saying they are from "Immigration" or they are calling because your computer has gotten infected .. or whatever.
And NEVER say your name OR say "yes". They can record you saying that and use that to release funds or set up a false identity.
If they call and ask if you are So-and-so .. reply with "Who is calling". If you do not recognize who this is, ask for their number and say you will call them back.
Then do a reverse-directory in the phone book, or google that name/company name. If you get no information, don't call back.
But it is just simpler to never pick up the phone. Those who have legitimate business will leave a message on your voice mail/answering machine. Those who don't .. won't leave a message.
The DO NOT CALL services are free, but where I live, they expire after a certain length of time and you have to renew them. They also do NOT screen out charities, political campaign calls, or those taking surveys (or CLAIMING they take surveys). Nor do they screen out the countries from 3rd-World countries trying to pretend their call is legitimate.
You can complain to various government agencies, but often they cannot do a thing .. especially for out-of-the-country calls.
In the end it comes down to this. The phone is YOUR convenience, YOUR servant. Just because it rings doesn't mean you have to pick it up.
As for wanting to connect with friends and families, use Caller ID, or a phone that announces the caller .. or tell these people to let the phone ring twice, then hang up and call again .. or some other signal that you DO want to take this call.
I will tell you this .. in 67 years of living only ONCE have I gotten an emergency call (husband had been in an accident and was in the hospital .. it as not critical no fatal, so I didn't have to rush to a deathbed).