Call Waiting - UK - Vodafone
At the same time as getting my Priv our business changed to Vodafone and whilst I had all the correct settings on the Priv I could not use call waiting (where I can see who an incoming call is and then decide if I want to continue on the current call or go to the new one).
Found a call waiting App which also had the solution written in the app screen: -
Simply dial *43# to turn call waiting on, #43# to turn it off and *#43# to check the service. So I deleted the app and used this and it works perfectly.
On a slightly different issue if you need to have call conferencing then this needs to be set by Vodafone