Leaving on Wednesday for 10 days. I know I can activate the world traveler rate and get 50mb and .99 a min. Where I get confused is.... A. if someone calls me while I'm there from the US and I don't answer. Do I get charged? B.What about if they leave a voicemail? What if I only check the voicemail? C. Do I get charged data "time" while using the GPS? I want to goto Paris, check my email once a day, use the GPS, use WiFi, and make an emergency call home if needed, that's it. Without getting a 300 dollar bill. What's my best bet? Thanks!