my wifi wont turn on

Hi

you are unable to turn on wifi on your iPhone 4s,

if you follow the below link it has some troubleshooting steps you can try

iOS: Wi-Fi settings grayed out or dim - Apple Support

i use wifi on my phone all the time and rely on it to auto connect to known networks for email , web browsing etc, its also better for battery life if you connect to wifi rather than using 3G or 4G all the time as you have a constant connection,

if you complete all the troubleshooting steps in the above link and the issue still remains contact apple support

<Edited By Host>

exactly the same problem khaly91 😟 I have iphone 4s with ios 8.1.3 and the wifi still not work...