Can't WiFi tether on AT&T plan that allows it..

I am using my SIM from an iphone, and my stock device won't let me enable WiFi hotspot, telling me it needs to be enabled on my plan. The tethering worked fine on the iphone and the 3GB Mobile Share plan I am on says that it is permitted.

Do other people have this working? Is this because they don't have my proper IMEI attached to the SIM? Does AT&T have these IMEI numbers in their database or will I lose LTE if I update my IMEI?

OTG hub what allows charging at same time?

Hey!

I have need to use multiple USB-devices on my s7e.
Finding OTG hub is easy, but find hub what allows charging at same time, is not so easy.

Tried some hubs, spec says that otg and charge at same time, but in real life, no go.

Any ideas?

Thanks!