Replace SIM/SD socket.
Change to the new SIM card.
If it doesn`t still work SIM card after changing
the SIM card, Check the U300 (Crack etc)
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Samsung Galaxy Note 3 SM-N900 Insert Sim Card not Working Solution
Samsung Galaxy Note 3 SM-N900 Insert Sim Card Error Solution
Samsung Galaxy Note 3 SM-N900 Sim Card Not Access Solution
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