I upgraded from a Samsung S10 to S20 and could use conference calls/merge calls. I am no longer able to use this. When I try to add a second call it says unable to merge calls/switch calls. I have been in two different Vodafone shops and they have looked at the account and phone and cannot work out what is wrong. They put a new sim in and it still won't work.
My brother had the exact same issue on the S21 and took it to a Vodafone shop. The woman in the shop made a phone call to tech and within 10 minutes it was sorted. She said it was something that had to be changed at their end regarding the amount of people allowed on the call. When I told the guy in the shop about this he had no idea. He said as far as he could see there was nothing wrong on their end and didn't know how to fix it.
