Introduction
Use this guide to replace the SIM card in your HTC One M9.
Tools
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            Insert a SIM card eject tool or a paperclip into the small hole besides the SIM card tray, located on the upper section of the left edge of the phone. 
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            Press to eject the tray. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.