Are you working away from your home or office and need Internet access? Do you have a family member that doesn’t have cellular capabilities away from home? You can share your mobile data using Personal Hotspot.
Go to Settings.
Tap Personal Hotspot.
Enable Allow Others to Join
Turn on Wifi if it’s not on.
Set a password for joining your hotspot.
If you have people in Family Sharing you can allow them to use your data automatically whenever they want or to Ask for Approval. I suggest the latter to avoid unexpected data usage if your mobile account doesn’t have unlimited data.
Your phone can now be joined as if it’s a WiFi network.
When someone joins you can let them know what the password is or you’ll be prompted to share when other Apple devices try to join.