Welcome to Vodafone Community
I am unable to add an addional vodafone user from my sure signal page....an error message 500, or something keeps displaying.
Are you able to assist by adding the vodafone number directly for me.?
Live Chat or Customer service on 191 should be able to help.
There was a recent post where the person found adding a couple of numbers at once worked.
Sonetines trying another Browser and or clearing the cache and cookies of the one your using helps.