OMG .....!,No wifi iphone4s,

I had the same problem and these are the steps I used to fix my wifi from not working.  I found this on the net so this is not mine.  I did 1-3 and then mine started working and so far so good:

 

1- iPhone WiFi issues? Reboot your device!

Well, I assume most of you have already tried that but in case you haven’t, simply press and hold the power key along with Home button until you see the Apple logo appearing again. If it solves the iPhone WiFi issues, congratulations. You had it the easiest way!

2- Reset network settings:

Resetting network helps in some 60 – 70% of cases suffering from iPhone WiFi issues. Go to Settings > General > scroll down to Reset, and then tap on Reset Network Settings. If you are on a secure network, it will ask you pass keys.

3- Check router:

Perhaps the issue is not with your iOS 7 updated device, but your internet connection? Before proceeding to the next fix, make sure your network is working fine and so is the router / modem. Try same network on your other devices to ensure that it is working fine.

If all is good with network and network equipment, proceed to the very last option.

 

 

 

    

4- Restore iPhone – Gah!

If you don’t seem to solve the iPhone WiFi issue using any of the above checkups, final resort is to reset your Apple iPhone. Resetting Apple device sort of cleanses your device so it will come out all clean and error-free like new.

To reset your iOS 7 device, head over to Settings > General > Reset, and tap on the Reset All Settings. You can also reset your device from iTunes. The option Restore iPhone will show up once you connect your device with the computer.