Is This Site For Real?

I was on youtube and there was a video of this website where u can find out who is calling from a blocked number. now, there's a free trial...and i wanted to know if any of you have heard of TrapCall .com. maybe the website doesnt charge you, but will your phone company? iii dont know. i would love to try it because i get frequent blocked calls....if anyone can give me any info, that would be nice. because i cant find anything over the web. thank you in advance! -Lia