I have the original blackberry and I am totally lost. I have t-mobile.

1. is there a shortcut to lock the phone? i mean besides going to the menu and scrolling to keylock?

2. is IM free as long as I am in an Wi-Fi area? so that means t-mobile won't charge me?

3. Also if I am in a Wi-Fi area, does that mean I can use the browser for free without t-mobile charging me?