If problem persist, just do a restore through iTunes, shouldnt be a problem.

Method to try.
1. Restart the phone a couple of times. If possible, slide to off.
2. Restart PC
3. Use a different port to connect to pc

# Try another PC with iTunes installed to find out if its a software problem or possibly damaged cable or worst, your phone's connector slot.

Are you within a wifi service range? Does your house have an open wifi?

Try getting to public area like Starbucks. You should be seeing lotsa network. If there still isnt anything detected, perform restore and rebreak.

You can detect the network but having difficulties connecting to it? Tried restarting your router?

Lol. Try this.

Touch the right arrow on that network's name.
It will show you the network's description etc.

Now scroll down and touch the "Forget this network"

Then try to connect to it again!

Afterall its not a common problem. The users probably did something wrong in the process of unlocking.