Some people on fluther are sticks in the mud, don’t worry, I had this exact problem, and I couldn’t figure out what to do either. I had to call apple, and that service costs several hundred dollars.
My phone started echoing when I talked on it, so I was told to recover it. When I tried, though, it got stuck on a little box that said “preparing iphone for recover” or something. I didn’t want to disconnect, I was afraid it would fry my phone or something, but it sat on this screen for hours. What I did was to just disconnect the phone, and restart my computer forcefully (because iTunes was stuck even after I unplugged the phone), and then the phone went back to it’s primal state of making emergency calls only, and had that globe background again.
I plugged it back in, and the computer recognized it as a new iphone, and offered to restore it with my backed up iphone information, or as a new phone. Depending on what your previous issue was, as I said earlier, choose one of these options, and It should be back to normal.
This was my situation anyway, and what I did.