Kdavi7
Thanks. I know most of what you said.

My question ( and I could just experiment when I'm there) is more just about dialing. For calling from US Verizon phone...

Is it like I am calling from the US, dial 011--590-xxxx to reach someone on the French side when I am already located there?
If I am dialing the US from the French side, do I just dial my contact like I was in Maryland?
I suppose that since the Dutch side is part of the North American area codes that is simply 1-721-xxxxx?