My iPhone 4 will no longer connect to Wi-Fi?

I have an iPhone 4. It doesn't have a carrier so I can't use it as an actual phone and so I have no data. I have just been using free Wi-Fi that I can pick up. I own a business and I live in the same building I work so I've always been able to connect to the Wi-Fi I use for the business, which isn't password protected. Now, suddenly, I can't get it to connect. It had been connecting briefly for literally like a couple of seconds, now it won't even do that much. I have turned the phone, and the Wi-Fi, off then on, reset the network connections and all that and I can't get it to connect. It used to come up with 2 Wi-Fi's- one labeled NETGEAR and the other NETGEAR EXT. One, possibly both, were coming from our router but now only the NETGEAR is coming up and sometimes that won't come up as an option either. There's one other network that comes up now but it must be my neighbors and it's locked. Any suggestions to fix this?

I sure others could come up with better answers but i suggest calling apple services. Your phone is pretty much just an ipod right now and i'm sure they could help you. Or call your internet provider and that will most likely work the best. Someone also couldve hacked your internet too since it was free but i suggest calling the providers

Your Wi-Fi antenna might be broken take it to the apple store and ask