Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
1 & 2 correct. 3 is wrong. With no wifi calling, you get charged roaming rates whatever country you call and those tend to be more expensive across the board than international long distance rates. I'd just buy a local SIM if I were you instead of dealing with a hefty bill with #3.

What is the difference between roaming and international rate?
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.