After installing a custom Android OS, I noticed that the tethering option was removed from the default WiFi menu. After doing a little reseach, I saw that some cell providers have also disabled this feature unless you “pay” for the service. In order to enable the WiFi tethering option again, all you have to do is add this line to your build.prop file. (I just downloaded a build.prop editor and you will need to be rooted)..
Save, then reboot and you will have the WiFi tethering option again.