Hi pete5331,
Welcome to the Vodafone eForum from all of the team and merry Christmas.
To be honest there is a couple of things that can cause this including the phone, its software and the network.
However, as this is happening in all locations it would indicate that it isn’t a network issue that is causing this.
To help resolve this issue the first thing to do would be to go into the settings, network settings and reset the network settings on the phone.
Once done, reboot the phone and try again, if you are still having issues I would perform a back up using iTunes and then restore the phone to its factory settings, connect this to iTunes and activate the Phone again with the carrier settings.
Give this a go and let me know how you get on.
James
