i have MANY questions about my new iphone?

[joe.attaboy]

1. How can listening to music you installed on your phone cost you any money? You're not using any of the phone's data services. You're just using it like an iPad when you do that.

2. Probably.

3. Unless you're downloading the videos off the Internet (not using wi-fi), then yes, it will. But if you're just copying them from your computer to the phone, why would that cost you anything? Do you have any grasp of how data networks operate? You DON'T GET BILLED for your own data.

4. How are we supposed to know this? If the app connected to something on the Internet, you will pay.

You will pay more when you go over the cap.