Global Calling- How do I get it?

Question

I am probably moving to Japan soon with a friend. We plan to open a business together lol. But the point of the question. I live in America with my grandparents (in between places right now) who have always been like parents to me. And I have never lived outside of the same county! Now that I'm an adult and am ready to REALLY dig my feet in and go, I'm noticing just how painul the adjustment is for all 3 of us living more than 20 minutes from each other. So brilliant me, I decided a simple way to make it easier on us- stay in contact. And not just mail and phone calls either. I found the perfect cell phone for myself, it's like a mini computer, the Sony Ericsson W810i, which is EDGE and GSM compatable. Because my grandparents don't play with the fun things on phones, but so they could recieve video, photo and call me when they like, I chose the Z500a, also EDGE and GSM compatable.

But how do I get EDGE or GSM? Are they both global? I need serious help here!

I am extremely challenged in the technology department!!!

Answer 1

GSM is global and the phone you have will work in most parts of the world.
As to Japan, thats the one part of the world I think your phone might not work. I do not believe Japan works on GSM, I know as of a couple of years ago they sisn't. Things might have changed and be different now but if they didn't, your phone will useless