Why is my data working but not my hotspot?
If your hotspot won't work, ensure the internet works and you're entering the right password. You can also try disabling battery saver or low power mode or restarting your phone's Wi-Fi. If your phone's hotspot still won't work, then tethering or turning the phone on and off might help.
Why isn't my hotspot working on my iPhone?
If you can't find or turn on Personal Hotspot, check that your wireless carrier enabled it and that your wireless plan supports it. Restart the iPhone or iPad that provides Personal Hotspot and the other device that needs to connect to Personal Hotspot. Make sure that you have the latest version of iOS or iPadOS.