Why Does My Phone Keep Saying Invalid Sim. Why Does It Say Invalid SIM Card Network Locked SIM Card Inserted. Turn off your Samsung phone and insert the new SIM Card.

Turn down your phone. Make sure that the SIM tray closes completely and isnt loose. If the card is damaged contact your carrier for a replacement.
Let get to know these different locks on your device now.
It will help you keep using your phone until you go and replace it. You have to type the code you received from the carrier. Go to Settings General About. Turn the device back on.

