New phone not working

Hi everyone, I’m really hoping someone here can help me. I traded in my iPhone 14 Pro Max for a Samsung S24 ultra earlier today. Because the store was closing, they told me to bring both phones home to do the transfer and return the iPhone in store tomorrow morning. I am all done with the transfer, the Samsung has the SIM card inserted, but i just can’t get it to work. I am still able to send texts through the iPhone, so i’m not sure what is going on here. I have tried everything, but nothing is working. Unfortunately all stores are now closed so i have to wait until tomorrow, but I’m hoping someone here can help me fix this unless it’s a SIM card issue of course.