Don't buy just the digitizer..in my experience Samsung LCD/digitizer combos are just that,a combo that doesn't like to come apart. Its possible but its a PITA.
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Past: HTC Dream, HTC Mytouch 3g, Samsung Vibrant, HTC Mytouch 4G, Samsung Infuse, Samsung Galaxy S II Skyrocket, Samsung Galaxy S II i777, Samsung Galaxy S II GT-i9100
Present: Samsung Galaxy Note II GT-N7100 PARANOID!