We have had the 203 area code blocked for over a year.
They can call from any telephone number they like but if they call from the 203 area code, they are BLOCKED!
received a few calls from them. picked one up and they said I have trouble with my PC and needed to log on with them right away. asked for their call back number - it was 800-986-6656. Googled that number, and it (along with a few other million or so numbers) is listed under a Chinese domain - 0313FC.com. googling that address gave no discernible info, except for 'color gradients'. guessing they are phishing for targets.