GadgetMenders
Link to part:
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A step-by-step tutorial on how to replace the front glass & digitizer assembly on the iPhone 3GS. This tutorial will also work for the iPhone 3G, however, be sure to purchase the correct parts. Anyone with a little patience should be able to complete this repair on their own with the right tools.
This will correct:
-Cracked Glass
-Dead Spots in Touch Screen
-Bad Home Button (Home Button part of Front Assembly)
-Bad Ear Speaker (Also part of Front Assembly)
Parts and tools kits are available on our website:
iPhone 3G Parts:
http://www.gadgetmenders.com/Replacement_Parts_For_iPhone_3G_list.html