Q: My iphone 4S is not connecting to the wifi!!

Hello aya133,

For this I would suggest using this article named iOS: Troubleshooting Wi-Fi networks and connections found here http://support.apple.com/kb/ts1398.

1. Be sure that you are in range of your Wi-Fi router (access point).
2. Tap Settings > Wi-Fi and turn Wi-Fi off and then on again.
   • If unable to do so, see this article.
3. Confirm that your Wi-Fi router and Cable or DSL modem are connected to power, turned on, and indicate that they are connected to the Internet.
   • If not, refer to your network administrator or ISP for assistance.
4. Restart your iOS device.
5. Tap Settings > Wi-Fi and locate the Wi-Fi network to which you are connected. Then tap > and Forget this Network. Try to connect to your desired Wi-Fi network again.
   • Note: You will need to enter your Wi-Fi password again if your desired network requires one.
6. Turn your Wi-Fi router off and then on again². If your ISP also provides cable or phone service, check with them before attempting this step to avoid interruption of service.
7. Update your device to the latest version of software.
8. Update your Wi-Fi router to the latest firmware².
   • For AirPort Base Stations, see this article for information about firmware updates.

And this section toward the bottom if needed:

Unable to connect to a Wi-Fi network

• Verify that you are attempting to connect your desired Wi-Fi network.
• Make sure you are entering your Wi-Fi password correctly.
  • Passwords may be case sensitive and may contain numbers or special characters.
• Reset network settings by tapping Settings > General > Reset > Reset Network Settings.
  • Note: This will reset all network settings including: previously connected Wi-Fi networks and passwords, recently used Bluetooth accessories, VPN and APN settings.

All the very best,

Sterling