How to remove the SIM card from your iPhone to replace it or throw it away

To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.

How to check if your iPhone is unlocked so you can change your wireless carrier

You can check to see if your iPhone is unlocked from a carrier using any of a few different methods.
CNET

How to Switch to eSIM From a Physical SIM on iPhone and Android

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) ...
Hosted on MSN

The whole truth of eSIM! What is this new technology, and how will it change your SIM card world? Complete guide for Indian users

eSIM Technology: Smartphone technology is changing rapidly, and now eSIM (Embedded SIM) is gradually becoming popular in place of traditional SIM cards. It is a digital SIM that is present directly in ...