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Aporte original por: omer ,


i had the same problem with my 4s after dissambling

look on the logic board the sim card slot

he has 2 little "legs" that supose to be allways connected.

maybe they not connected now.

try to change the angle of 1 "leg" that will touch the second "leg".

*look down the picture.. this legs..  they need to be touched each outher when your without sim card tray.

when you insert sim card with the tray holder , it will reconized it , becuse the legs will be seperated.

good luck! let me know if you sucsess (email)