Hotspot

If hotspot icon is greyed out and hotspot settings is missed, try to check your APN credentials:

Settings > Mobile Data > Your SIM > Mobile Data Network.

You can get this settings from website or support of your mobile carrier.

Hotspot is carrier specific feature --> Contact your Carrier (Cellular Service Provider) The agency who issued the SIM to you

Click --> If Personal Hotspot is not working on your iPhone or iPad (Wi-Fi