Wednesday
Wednesday - last edited Wednesday
Is mobile data working ok for you normally?
If so then the issue may be the one described here under the title "A note about personal hotspot setup on iPhones":
If that doesn't help then you'll have to describe the issue in more detail.
What steps are you taking to configure your hotspot, what happens/goes wrong, any error messages, etc.
If you need to contact 48 support about this then see the links in my signature below.