The T-Mobile G1 features a capacitive touch screen, which means it will only respond to the touch of your finger and not your fingernail or other objects, like a stylus. However, if you crave the accuracy of a stylus, the Soft-Touch Stylus is a good solution. It lets you type, tap, and scroll and won't scratch the touch screen. It costs $12.99 and works on other touch-screen phones.