4s wifi problem

Hey there alfifar,

Depending on the specific symptoms you are seeing when you try using the Wi-Fi connection on your iPhone 4s, the troubleshooting can vary a bit. Start with these steps from the following article:

iOS: Troubleshooting Wi-Fi networks and connections

1. Tap Settings > Wi-Fi and turn Wi-Fi off and on. If your Wi-Fi setting is dimmed, follow these steps.
2. Confirm that your Wi-Fi router and cable or DSL modem are connected to power, turned on, and connected to the Internet. If not, refer to your network administrator or Internet service provider (ISP) for assistance.
3. Restart your iOS device.
4. Tap Settings > Wi-Fi and locate the Wi-Fi network to which you're connected.
5. Tap and Forget this Network.
6. Try to connect to your desired Wi-Fi network.
   Note: You may need to enter your Wi-Fi password again if your network requires one.
7. Turn your Wi-Fi router off and on2. If your ISP also provides cable or phone service, check with them before attempting this step to avoid interruption of service.
8. Update your device to the latest version of software.
9. Update your Wi-Fi router to the latest firmware2. For AirPort Base Stations, install updates using the AirPort Utility.

If the issue persists, you should look at the bottom half of the article and use the troubleshooting steps recommended for the symptoms you are seeing.

Thank you for using Apple Support Communities.

Cheers,

Sterling