Wi-Fi Calling has no update from Samsung, nor any update at all. This is a message to activate the feature on the chip, and this is from the user’s telecom company. There are companies that have activated the feature without an activation message, such as we. You do not need to change the CSC because it has nothing to do with the feature at all. To make sure of what I am saying, install the we chip and you will find the feature has appeared in the settings
