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Insert a SIM card eject tool or a paperclip into the small hole in the SIM card tray.
Press to eject the tray.
This may require a significant amount of force.
Why isn't this the first step in the process? Seems unnecessarily risky to fumble with popping the SIM in and out when you've already opened up the phone.
If you don't have something small enough to open it, you can use the lever when the screen is off.
I actually removed the simcard as the first step because I didn't want to risk fumbling with an open phone (as someone previously mentioned)
Remove the SIM card tray assembly from the iPhone.
When reinserting the SIM card, ensure that it is in the proper orientation relative to the tray.
After reassembly phone would not detect SIM Card.
During repair while components were out of phone I used that opportunity to straighten the back case that was bent. While straightening the back case I bent the thin edge of the back case by the SIM Card slot. SIM Card would click into place and seemed to make a good connection but the phone would not detect the SIM Card. After really straightening the back case by the SIM Card slot almost back to cherry the phone would now detect the SIM Card. The tray has to fit really flush with the case.
WiFi-Direct