In order to fix a SIM card so that it can be read by your phone, you need to do the following: 1. Turn off your phone. 2. Take out the SIM card. 3. Take a pin or needle and gently poke it into the little hole on the back of your SIM card.Make sure your SIM card is inserted firmly. Make sure the SIM card is inserted facing the right way, so that the gold contacts are facing down. If you're unsure, check the instructions provided by your carrier.