Thanks guys. Lastly, what if I wanted to use my iPhone for navigation? Does that use data that will be charged?

I dont want to get back with a large roaming bill. I plan to use the Skype app for all my calls and the Hotel WiFi for checking email. Is there anything I need to do to my phone to make sure Im not being charged "in the background"? Im thinking about turning off Push Notifications...

1) When I delete an app, does all supporting files get canned with it or are there lingering files that will eventually bogg my iPhone down? 2) Is there an app that can tell me file size of pics, movies, emails...etc. Kinda like a "Command-I" deal? 3) Im in flight school and have GPS...

Im Erick I have an iPhone 4 Im in flight school I love to scuba dive I live in SoFlo (south Florida) Happy to be here!