Q: 5c cannot turn on wifi

Hi, Scottyfromnj.  

Thank you for visiting Apple Support Communities.  

Here is an article that I would recommend going through when experiencing this issues.  

 

Wi-Fi and Bluetooth issues

See these articles for help with troubleshooting Wi-Fi issues:

• iOS: Troubleshooting Wi-Fi networks and connection
• iOS: Wi-Fi or Bluetooth settings grayed our or dim
• AirPort and Bluetooth: Potential sources of wireless interference

iPhone: Hardware troubleshooting

http://support.apple.com/kb/TS2802

If the issue persists, see the last section labeled Issue Not Resolved.  

Cheers, 

Jason H.