Welcome to Vodafone Community
Are you Pay Monthly or Payg.
I assume you can text and receive texts and make and receive calls.
If this was happening to me this is what I'd check...
To Note > If you have recently ported into Vodafone from another network bringing your number with you, and it's been a few days since your Porting in date then please do call customer service and ask for this to be checked that this isn't what's known as a Split Port which is where not all the files have settled correctly. Customer service should escalate this issue to the Porting Teams to remedy.
If you click the device support link below, you will be able to find the APN settings for your phone model.
It is very important to select the correct APN for PAYG or contract.
If you are PAYG, the phone APN setting have to be set to pp or contract for pay monthly.
You can also try updating the SIM on the network. Depending on the phone you have, this is done by going into your network settings and scrolling down to more, mobile networks, when the networks come up, choose and alternative network, wait for it to kick you out and reselect Vodafone UK.
If you continue to have problems installing the correct settings, live chat will be able to guide you. Alternatively, pop into a Vodafone Store for help and support.