Hi
What checks have you carried out thus far ?
Ie :
Checking their masts status via
https://www.vodafone.co.uk/our-network-and-coverage/uk-coverage-map/Is anyone else in your area on Vodaphone having similar issues.
Trying ure Sim in another phone as a process of elimination 2 rule out the phone or sim that may be at fault.
Sim swap to move your number and tariff from your original sim to a new one.
Resetting the Network on the iPhone via Settings-> General -> Reset -> Reset Network Settings.
Apple Stores run diagnostics via Genius Bar Appointments. 's link to make an appointment is
https://www.apple.com/uk/retail/geniusbar/
Current Phone >
Samsung Galaxy s²⁴ Ultra 512gb.