Home Button Problem on Verizon or Sprint iPhone? Here is Some Help
"If the Home button on your Verizon or Sprint iPhone 4 is not responding when you press it, or sometimes misreads a double tap, you may need to get it fixed."
A problem if you are out of warranty. Or, perhaps not. Following the tips in the article it's possible to take care of it yourself. Just make sure you give it a thorough read to make sure it's something you can handle.
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