There might be a problem with your carrier settings. Turn on your iPhone then follow these steps. Your iPhone must connected to the internet.
Open up Setting/Cellular/Cellular Data Network
Cellular Data Network contents:
Cellular Data
MMS
Personal Hotspot
Our target is Personal Hotspot. Of course, Personal Hotspot requires
APN
Username
Password
Now you are must create an account. I mean Personal Hotspot Account. Enter your optional Username and set up optional Password. And APN field is must be leave empty. See below:
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