her ideal and also a picture of your sim socket is damaged (or lost it)
try to lift his sim card reader to work more easily
whether point lead on the mainboard is still there
Samsung Gt-N7000 Insert SIM card Solution
Samsung Gt-N7000 Sim Connecter Ways Jumper Track Solution
Samsung Gt-N7000 Note Sim Not accepting Problem Repairing Jumper Fix Problem Solution
You may first check the SIM supply voltage (USIM) pin and ground pins, then the SIM Clock pin.