Global Cell phone How To??

[RStar]

Ok, all you world travelers!

This is my first trip to Europe, so I'm unfamiliar with how this works.

I have a Global phone on the way, and will be transfering my phone number to it.

Now, because my number is a USA number, I know I will need to dail the country code to call someone in London (44), but do I also need to dial the 00 (NDD-National Direct Dialing)? And why do I hear differences in country code of 011 and 44 for england? Other times I hear +1 (plus being hold down the 1 button or the # button).

I will be calling people in London, and Paris. I know that to call the USA from my phone I will just dial the 1-714 as if I'm home, but I'll also need to figure out how to call the USA from a European phone.

HALPPPP!!!!