If you need to find out your iPhone's carrier without a SIM card installed, you can do so through the Settings app.
To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.
Watch the transformation of damaged smartphones, including an iPhone XR, OPPO A16, and iPhone X, as they are expertly restored into high-end models like the iPhone 13 Pro.