The "Insert SIM Card" problem can be irritating when it keeps on popping up even when a SIM card is actually been inserted into the phone's SIM card holder. It can sometimes be remedied by cleaning both the SIM card and the holder terminals with a cotton swab immersed in alcohol; most preferably 70% alcohol solution. Sometimes the holder is not tightly holding the SIM card causing the problem. This can be solved by padding up the back of the SIM card with a small sheet paper or any appropriate material enough for the holder to hold the SIM card tightly. Another way to fix the problem is by bending in the mid-section of the SIM holder cover.
Nokia 1110, 1110i, 1200, 1028, 1209 and all other member of the family of Nokia phones with USB ports similar to the ones mentioned earlier have the tendencies to experience the "Insert SIM Card" problem not due to a dirty terminals nor a loose holder but due to dirty, soiled, or oxidized USB port terminals. The fix is just as simple as cleaning the USB port terminals but make sure to remove the phone battery prior to the cleaning. Use a paper clip, a safety pin, or a needle with bended tip to scrape off the dirt between the port terminals and dip it in alcohol to wash it out.
The cleaning can be done without the necessity of disassembling the phone but if proper tools are available, disassemble the phone to clean the inside of the system connector, the one where the USB port, the charging socket, and the headset socket are located.
System Connector
People may wonder how a dirty USB port can lead to the "Insert SIM Card" issue and guess what; it is not even included in the Nokia Service Manual. The fix was discovered accidentally and proven many times that a dirty USB port is indeed the source of the problem.
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