Hi,
It seems you have broached many of the generic self help techniques.
Which ones have you tried ?
Plz try ure Sim in another phone as a process of elimination 2 rule out the phone or sim that may be at fault.
You may want to try a sim swap which moves your mobile number and tariff from your nano sim to a new one to see if that helps. Any Vodaphone shop can help and more info here
http://www.vodafone.co.uk/discover-vodafone/all-customer-benefits/sim-swap/Speak to Vodaphone customer services just to check your account.
Current Phone >
Samsung Galaxy s²³ Ultra 512gb Phantom Black.