Introduction
This guide will explain how to replace the SIM card of the LG Optimus L90.
Tools
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            Carefully slide an opening pick between the the rear cover and the body of the phone. 
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            Using the pick, separate the cover from the back of the phone. 
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            Remove the rear cover. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.