What can be done to solve the wifi problem in iphone 4s

Hello prajwal13,

Thanks for using Apple Support Communities.

To troubleshoot issues with connecting via Wi-Fi start with these steps:

• Be sure you're in range of your Wi-Fi router (access point).
• Tap Settings > Wi-Fi and turn Wi-Fi off and on. If your Wi-Fi setting is dimmed, follow these steps.
• 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.
• Restart your iOS device.
• Tap Settings > Wi-Fi and locate the Wi-Fi network to which you're connected.
• Tap and Forget this Network.
• 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.
• 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.
• Update your device to the latest version of software.
• Update your Wi-Fi router to the latest firmware2. For AirPort Base Stations, install updates using the AirPort Utility.

If you still experience these random disconnects from your Wi-Fi network, please follow below:

• Move closer to the Wi-Fi router (access point).
• Check for sources of potential interference.
• Remove any case, stand, or other accessories from your iOS device and see if signal strength improves.
• 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

iOS: Troubleshooting Wi-Fi networks and connections

http://support.apple.com/kb/TS1398

Take care,

Alex H.