How much could I sell a messed up iphone 4 for?

The home and power button barely work. It's also really hard to hear people when they are talking. It is in perfect condition besides this. There's not one scratch on it. I'm planning on selling it on ebay or craigslist because I'm getting the iphone 5.

Why won't my iphone place calls anymore?

This didn't happen until I upgraded to ios 6 last night and since then I can't place a call. I will select a person to call and it starts but it never connects then just says call ended. I have an iphone 4, that i got a few months ago.

Added (1). I can still text, listen to music, surf the web, basically everything else

Added (2). I have turned it on and off, and also done a hard reset, neither worked

How much could i sell a used iphone 4 for?

I have a used fourth generation iphone ( not 4s no siri or anything) and i'm looking to get the 5th generation so what's the minimum and maximum price i could sell it for?

Why won't my iphone restore and update?

Lastnight I decided to update to the IOS 6 on my iphone. Well i figured i wouldnt have any trouble so i went to sleep. I won't up this morning to find that my phone was stuck on one screen and wouldnt do anything else. It has the itunes symbol and then a usb plug in pointing to the itunes symbol.basically telling me to plug my phone up to itunes.well i plug my phone into itunes and it tells me that i need to restore and update so i did.well after two long hours of "restoring and updating" my phone still says the same thing. The screen won't change. I've tried cutting it on and off and it will do that. But thats it. It goes right back to that same screen. I don't know what else to do and i need an answer soon! Please help! Sorry for bad grammar and punctuation i'm just a little ticked at the moment!

How to delete Winterboard without Cydia?

Okay. So i jailbroke my iPhone 4, now I want to reverse it. Yet, it won't let me restore my iPhone? WHAT DO I DO!

Added (1). I deleted Cydia, but it still won't let me restore or update my iPhone?