I learned a new one yesterday. After setting up my new iPhone 13 Pro Max everything seemed to work great. It was late so I went to bed. Next morning I’m checking it out and tried to call my son, no way just a message from Verizon saying call could not be completed as dialed. Same for everyone I tried to call or text. Frustrating, my new phone did everything great and fast except MAKE PHONE CALLS. A trip to the Verizon store solved the issue. Seems that the SIM card in my two year old iphone 11 Pro Max was 4G and the new iphone will only work on a 5G SIM card. A free exchange and everything is great. Seems Apple could have tipped me off to this possibility.