"Personal Hotspot" option DISAPPEARED yesterday after upgrading to iOS 8.1.3!

Hello,

yesterday I upgraded my iPad Mini (Retina) to iOS 8.1.3. Everything works pretty fine, but there is no Personal Hotspot in the Settings! I was looking in all sections, but it has simply disappeared.

I really don't know what to do. I've been using my iPad as a hotspot for a year, almost every day. :/

I have reset all web settings and, of course, turned off and on the iPad. Nothing's changed.