I bought a verizon iphone 4 had the same prob. This worked for me take a soft tooth brush with a little CLR and clean the !@#$ out of the charging port.... volume buttons are back sound is loud and clear
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== Update ==
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Also clean head phone jack with q-tip but very hard to do
I bought a verizon iphone 4 had the same prob. This worked for me take a soft tooth brush with a little CLR and clean the !@#$ out of the charging port.... volume buttons are back sound is loud and clear