I dropped my Nexus 4 and cracked the front glass in the top right corner. The damage doesn't bother me much, it's only in the corner and I can hardly see the very fine crack running across the screen. But touch is not responding, so I can't unlock or use the phone. All I can do is turn it on/off using the power button on the side. Does anyone know if there's anything I can do to this phone myself to restore use? And whether replacing the glass will make it responsive to touch again, or if this is an issue with something else? Thanks!