Q: Wifi lossing signal iphone 4s

Hey Henriqueavieira,

Thanks for the question. I understand that you are experiencing issues with Wi-Fi connectivity on your iPhone. The following resource may provide a solution:

iOS: Troubleshooting Wi-Fi networks and connections

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

1. Be sure you're in range of your Wi-Fi router (access point).

 

2. Tap Settings > Wi-Fi and turn Wi-Fi off and on. If your W-Fi setting is dimmed,follow these steps.

 

3. 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.

 

4. Restart your iOS device.

 

5. Tap Settings > Wi-Fi and locate the Wi-Fi network to which you're connected.

 

6. Tap  and Forget this Network.

 

7. 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.

 

8. Turn your Wi-Fi router off and on. If your ISP also provides cable or phone service, check with them before attempting this step to avoid interruption of service.

 

9. Update your device to the latest version of software.

 

10. Update your Wi-Fi router to the latest firmware. For AirPort Base Stations, install updates using the AirPort Utility.

 

[...]

 

Unable to connect to a Wi-Fi network

 

1. Verify that you're attempting to connect to your desired Wi-Fi network.

 

2. Make sure you're entering your Wi-Fi password correctly. Passwords may be case sensitive and may contain numbers or special characters.

 

3. 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

 

Thanks,

Matt M.