You've put your number on the "National Do Not Call List" and yet, you STILL get calls.  You look at these numbers on your phone and try to decide, do I know someone in this area code?  I can tell you that if you are getting a call from the following numbers according to MSNBC, they're NOT your friends.  They're SCAMMERS.  Let it go straight to voice mail or block them altogether.

473,  809,  and of course  900.

ALso, these are the other international area codes with a +1 country code you should avoid.

242 — Bahamas

246 — Barbados

268 — Antigua

284 — British Virgin Islands

345 — Cayman Islands

441 — Bermuda

473 — Grenada, Carriacou and Petite Martinique

649 — Turks and Caicos

664 — Montserrat

721 — Sint Maarten

758 — St. Lucia

767 — Dominica

784 — St. Vincent and Grenadines

809, 829 and 849 — Dominican Republic

868 — Trinidad and Tobago

869 — St. Kitts and Nevis

876 — Jamaica

Hope this helps.

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