When disassembling my iPhone5 I found a lever under the SIM card slot which is not mentioned or shown in any of the repair guides. Without the lever installed the SIM card slot will not open. I found this out when taking the phone about the lever and screw fell out of the device. I did not realize where it went back. Once I reassembled the device and could not get the SIM card to open I understood the significance of the part. Be sure to replace on reassembly.