How to use my SIM card in my iPhone?
How to use may sim card in my phone
[Re-Titled by Moderator]
It depends on the model that you have and the country that you have purchased from.
To pop open the SIM tray, insert a paper clip or a SIM-eject tool into the hole beside the tray. Push in, towards your iPhone, but don't force it. If you're having difficulty ejecting the SIM tray, take your device to your carrier or an Apple Store for help.
Remove or switch the SIM card in your iPhone - Apple Support
You can use Dual SIM by using a physical SIM and an eSIM. iPhone 13 models and later also support two active eSIMs. iPhone models without a ...