the home button on my iphone 4 just currently started acting weird. Sometimes (most of the time actually) when I press in my home button it makes like a double click sound, and it feels as though theres something stuck underneath it. Heres the catch, I bought this phone off ebay and use it through Verizon. Would I be able to get the phone serviced if this is the case? Would something like this cost a lot of $$?