This has cropped up before.
If you search the forum for "hotspot" or "personal hotspot" you may find some useful info.
E.g.:
http://community.48months.ie/t5/Need-Help/Personal-Hotspot-not-working/m-p/26679/highlight/true#M843...
It's possible that this is an Apple/iOS issue - e.g.:
https://discussions.apple.com/thread/5983517?tstart=0
All 48 support is online so nobody is going to call you back about this.
You probably shouldn't post your phone number on a public forum like this.
If you want to get in contact with 48 support about this then see this key topic:
How to get help
Hope this helps.
