If you hate using the touch screen to end calls, Froyo (Android 2.2) allows you to use the Power Button (the button on the top of the phone for powering on/off the phone and locking the screen) to end a call. It’s nice to have a physical button to hang up when you’re done.
1. Go to the Home screen.
2. Select the Menu key.
3. Select Settings.
4. Select Accessibility.
5. Check the Power button ends call checkbox.