Go to another city and check it. It will go to 5G again after call. I got same problem in my home but never get this problem where i work. I don't think it is samsung's problem. Now wait for VoNR
As per your query, we want to inform you that this is not a bug or issue, It's a Normal phenomenon of the devices because device networks support 5g but calling does not support so it automatically converts into 4g while calling, If you have other concerns regarding Samsung products kindly feel free to get in touch with us if there is any issue regarding the Samsung.
