Remove or switch the SIM card in your i…
https://support.apple.com/en-us/109357
To open the SIM card slot on an iPhone, you'll need to use a SIM-eject tool or a paper clip. Here's how you can do it: Insert the SIM-eject tool or a straightened paper clip into the small hole beside the SIM tray. Gently push in towards the iPhone, but don't force it. The tray should pop out. Remove the SIM card from the tray, and if you're replacing it, ensure the new SIM card is placed correctly with the notch in one corner. Insert the tray back into the iPhone in the same orientation that you removed it. It should fit only one way due to the notch.
Insert the SIM-eject tool or a straightened paper clip into the small hole beside the SIM tray.
Gently push in towards the iPhone, but don't force it. The tray should pop out.
Remove the SIM card from the tray, and if you're replacing it, ensure the new SIM card is placed correctly with the notch in one corner.
Insert the tray back into the iPhone in the same orientation that you removed it. It should fit only one way due to the notch.
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