Can't turn on call forwarding and call waiting
iPhone 13 Pro Max
15.0.1
Optus Australia
Error: error: could not save call waiting settings while call forwarding just loads
Talked to Optus and was referred to Apple and when I put the Vodafone sim on the iPhone, it can activate the features.
What can you suggest? Is there something wrong with my Optus Account?
iPhone 13 Pro Max