The glass of the 3GS touchscreen digitizer was broken
I'm very familiar of repairing iPhone Original / 3G / 3GS and recently 4 so it don't take so long to replace the digitizer
The tricky parts are :
- Removing the broken glass from the frame, don't heat so much because it twist the plastic frame, especially near the home button.
- When you're stick the new glass, align it very well to fit with the frame and home button hole