Q: wifi greyed out wont slide over

Hello sumimabe7,

That is never a fun time if you cant use Wi-Fi on your iPhone. To take care of that take a look in the article below for some simple troubleshooting like restarting your iPhone, resetting network settings and making sure that your iPhone is up to date. If all is good and you are still having issues then you will need to contact Apple for additional support. 

iOS: Wi-Fi settings grayed out or dim

https://support.apple.com/en-us/HT204324

Regards,

-Norm G.