To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.
Tech Advisor on MSN
How to switch SIMs on iPhone, including eSIM
Changing physical SIM cards on your phone is always a fiddly business. First, you have to root for the little SIM tray tool that Apple includes in the box with its new iPhones – except those in the US ...
If you need to find out your iPhone's carrier without a SIM card installed, you can do so through the Settings app.
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