Changing physical SIM cards on your phone is always a fiddly business. First, you have to root for the little SIM tray tool ...
The newer eSIM technology, which is quickly becoming the standard on high-end phones, is safer and more convenient.
If your new phone no longer supports SIM cards, or you don't want to use them anymore, you can convert to eSIM instead. I started my career with CNET all the way back in 2005, when the (original) ...