Yes, service is on AC. The connection was excellent, I used it in my room. It is 2.99 a minute, also, if you leave your phone on and do not answer it and it goes to the voice mail, they still charge per minute. If you leave it off, that charge does not apply. Yes, all you have to do is tell them that you want international calling, they will ask what country, and see if you phone has enough bands.There is not additional charge for the set up, either.
Hope this helps,