Been 6 days of no internet now.... whatsapp support is non existant, can't get voice access, log tickets to get told that I'll get feedback in 24 to 48 hours..... 6 days later, nothing! Infuriating - can't work from home, kids can't do school work - and I'm paying for a service that...
I just had the same issue... go into Settings-General-Network-Personal Hotspot For some or other reason mine had changed to off, switched it on and off we go!