Hi
Check your masts via
https://www.vodafone.co.uk/explore/network/uk-coverage-map/index.htmIs link holds some tips and a template to re post and leave your answers next to for the Tech Team to help you.
http://forum.vodafone.co.uk/t5/Network-queries/Network-issues-initial-checks-and-template/td-p/18566...Other tips are to ->
Turn Phone off, eject sim and clean it , re insert and turn phone back on to refresh connection to the Network.
Process of elimination: Can U try ure Sim in another phone2 rule out either the Sim or Phone which may be at fault.
Contact Vodaphone Customer support on 191 or 03333040191 from a landline or use Live Chat from a Pc or Mac. Leave the chat window open for chat to initialise to have your account checked over.
Hope this resolves for you soon.
😎
Current Phone >
Samsung Galaxy s²⁴ Ultra 512gb.